Toe Turning Black: What It Means and How Urgent It Is
Skin goes black for two reasons: blood pooled under it, or the tissue died. If you cannot name an injury, assume the second until someone proves otherwise.
Most searches for a black toe are really about a black toenail, and that is a different and much less worrying question, answered here. This page is about the toe itself: the skin, the tip, the pad, or the whole digit turning dark purple, grey, brown, or black. That list of causes is shorter, and it is far more serious at the top.
Skin has only two ways of turning black. Either blood has leaked under it, which needs an injury to explain it and fades on its own, or the tissue has lost its blood supply and is dying, which does not fade and does not wait. The whole job of this guide from the wound care podiatrists at ASG Foot & Ankle is to help you tell those two apart tonight, rank the causes by how fast they need to be seen, and explain what a wound care clinic actually does about a toe that is going dark.
Medically reviewed by Julia Shauger, DPM and Dr. Timothy Horak, board-certified podiatric specialists serving Homewood, South Chicago Heights & Mokena. Last reviewed September 2026.
The short answer
Stubbed it, dropped something on it, or ran a long way in tight shoes? A purple, tender, warm toe that slowly turns green and yellow is a bruise. Watch it. No injury you can name? A toe that is dark, cold, numb or aching at night, and does not lighten when you press it is a circulation problem and needs to be seen today. Dark plus swollen, blistered, weeping, smelly, or you feel unwell? That is infected dead tissue. Go to the emergency department now, especially if you have diabetes.
Emergency Department Tonight If
- •The black area is swollen, blistered, weeping, or smells bad
- •Redness or a dark streak is spreading from the toe up the foot or leg
- •You have fever, chills, confusion, or feel suddenly unwell alongside the toe
- •The toe or foot went cold, pale, or blue suddenly with severe pain, which can mean a blocked artery that has hours, not days
- •Several toes turned dark at once with no injury, particularly after a heart or vascular procedure
- •You have diabetes and cannot feel the toe well enough to know whether it hurts
Everything else on this page that is not a bruise should be seen the same day or the next morning by a podiatrist or wound care clinic. A black toe is not a condition that improves with a week of observation.
"But I Did Not Injure It"
That sentence changes everything about how a black toe should be handled. Pooled blood needs a blow, a crush, a tight shoe over many miles, or a nail lifting off its bed. Without one of those, the dark color is almost always the tissue itself, and tissue turns dark when the small arteries feeding it stop delivering blood.
Three things do that in a toe. The big leg arteries have narrowed over years from smoking, diabetes, cholesterol, or age, and the toes, at the far end of the line, are the first to run short. A small fragment of clot or plaque has broken off from higher up and lodged in a toe artery. Or an infection nearby has swelled the tissue enough to squeeze the vessels shut. All three are diagnoses of the blood supply, not the skin, and the treatment is aimed at the artery, not the toe.
The exception is a toe that has been dark for months, is flat, painless, normal temperature, and slowly enlarging: that pattern belongs to melanoma, and it is covered below. It is not urgent tonight. It is urgent this month.
The Eight Causes, Ranked by Urgency
For each: what it looks like, what it feels like, and who it tends to happen to. Match yourself on all three, not just the color.
Poor circulation (peripheral artery disease)
Same day- Looks
- Dusky purple to black, often starting at the tip; toe cold; may be a sharp line between dark and normal skin
- Feels
- Deep aching, worse at night and eased by hanging the foot off the bed; or numb if nerves are also damaged
- Who
- Smokers, diabetes, over 60, known heart or artery disease, calf pain when walking that stops with rest
Wet gangrene (dead tissue plus infection)
Emergency room now- Looks
- Black or dark with swelling, blistering, weeping, foul smell, redness spreading up the foot
- Feels
- Often painful, or numb in diabetes; person may feel unwell, feverish, shaky
- Who
- Diabetes, any recent foot wound, ingrown nail or blister that was not healing
Blue toe syndrome (clot or plaque fragments)
Same day- Looks
- Sudden blue or purple patches on one or more toes, sometimes a lacy purple pattern on the foot; pulses often still present
- Feels
- Painful, tender, toe may be cool
- Who
- Recent heart catheterization, vascular procedure, or newly started blood thinner; known aortic plaque
Frostbite
Same day- Looks
- White and hard at first, then red and blistered on rewarming, then dark or black over days
- Feels
- Numb, then burning and throbbing as it thaws
- Who
- Cold exposure, wet footwear, outdoor work, homelessness, alcohol
Bruise or blood under the skin (hematoma)
Routine, unless it does not fade- Looks
- Purple to dark purple rather than jet black; tender; warm; changes color to green and yellow over 1 to 2 weeks
- Feels
- Sore to touch, otherwise the toe works normally
- Who
- Stubbed toe, dropped object, tight shoes, long runs or hikes; may involve the nail too
Blood blister or pressure sore with a black scab (eschar)
Same week; same day with diabetes- Looks
- A defined dark patch or scab over a pressure point such as the toe tip, knuckle, or side of the little toe
- Feels
- May be tender or numb; the black cap can hide a deeper wound
- Who
- Bedbound or wheelchair users, hammertoes rubbing in shoes, diabetes and neuropathy
Medication or blood vessel inflammation
Same day- Looks
- Purple or black toes, sometimes several, sometimes both feet; may come with a rash or joint pain
- Feels
- Painful
- Who
- Vasopressor drugs in hospital, certain blood thinners in the first days, autoimmune disease, heavy smokers under 45 (Buerger's disease)
Melanoma (acral lentiginous)
This month, do not delay- Looks
- Flat dark brown or black patch, irregular border, uneven color, slowly growing over months; on the toe, sole, or under a nail as a widening streak
- Feels
- Painless, toe temperature normal, does not fade
- Who
- Any age or skin tone; the commonest melanoma in people with darker skin
Dry Gangrene vs Wet Gangrene
Gangrene simply means dead tissue. The word that matters is the one in front of it, because dry and wet gangrene are managed on completely different clocks.
| Feature | Dry gangrene | Wet gangrene |
|---|---|---|
| What it is | Tissue that died from lost blood supply, no infection | Dead tissue that bacteria have moved into |
| Appearance | Black, dry, hard, shrunken; sharp line to normal skin | Black or dark, swollen, blistered, weeping, edges spreading |
| Smell | None | Foul |
| Whole body | Person feels well | Fever, chills, feeling unwell; can progress to sepsis |
| Speed | Days to weeks; stable if circulation is restored | Hours to days; spreads up the foot |
| Priority | Restore blood flow so the rest of the foot survives; dead part may separate on its own | Emergency antibiotics and surgical removal of dead tissue |
| Where to go | Wound care clinic or podiatrist, same day or next morning | Emergency department |
Dry can become wet. A dry black toe tip that gets knocked, soaked, or picked at opens a door for bacteria, and the change shows up as new swelling, a smell, or redness creeping onto the foot. That switch is the reason a dry gangrenous toe is kept clean, dry, padded, and reviewed often rather than simply left alone.
The Five-Minute Circulation Check at Home
None of these replace an exam, but together they tell you whether tonight or tomorrow is the right answer.
- Temperature. Compare the dark toe and its foot with the other side using the back of your hand. A cold dark toe is a blood-supply problem. A warm one is more likely a bruise, or infection if it is also red and swollen.
- Press test. Press firmly on the dark skin for three seconds and release. Living skin, even bruised, lightens a little and the color returns. Dead tissue does not change at all.
- Capillary refill. Press the pad of a normal toe on the same foot until it blanches, then let go. Color should return in under three seconds. Slower than that says the whole foot is short of blood, not just the dark toe.
- Night pain. Does the foot ache when you lie flat and feel better when you hang it off the side of the bed or sit in a chair? That pattern is called rest pain, and it means the arteries are struggling even without walking.
- The walking history. Have your calves been cramping after a fixed distance and easing when you stop? That is the classic sign of narrowed leg arteries, and it usually starts months before a toe changes color.
Any "yes" on 1, 2, or 4 with no injury to explain the toe means the same day. All five negative and a story that fits a bruise means watch it for a week and expect it to change color.
If You Have Diabetes, Read This Part Twice
Diabetes is the background to most black toes we see, because it works on three fronts at once. It narrows the small arteries below the knee, so the toes run out of blood first. It blunts the nerves, so a blister, a stubbed toe, or an ingrown nail can become a deep infection without the pain that would make anyone else look. And it dampens the immune response, so infection travels.
The practical consequences: the home checks above are unreliable if you cannot feel the toe, a black toe in diabetes is treated as limb-threatening from the first visit, and "it does not hurt" is not reassurance. It is the reason to go sooner.
The workup in our wound care clinic includes measuring the blood supply, probing any break in the skin to see whether it reaches bone, imaging if infection is suspected, and, where the arteries are the problem, a same-week referral to a vascular specialist. Getting blood back to the foot is what decides how much of it we keep.
What a Wound Care Clinic Does About It
The visit is aimed at three questions in order: is the toe getting blood, is it infected, and how much of the tissue is still alive. The answers decide everything after.
Finding out
- Handheld doppler and ankle-brachial index to measure arterial flow to the foot
- Toe pressures when the leg arteries are stiff and the ankle numbers cannot be trusted
- Probing any wound to see whether it reaches bone, and X-ray or MRI if it might
- Blood tests and cultures when infection is in play
- Biopsy of a flat dark patch that has been there for months
Treating it
- Vascular referral for angioplasty, stenting, or bypass when the artery is the cause; this is the step that saves feet
- Antibiotics chosen for the depth and type of infection, intravenous if it has reached bone or the bloodstream
- Sharp removal of dead tissue so infection has nowhere to hide and healthy tissue can heal
- Offloading footwear or a total contact cast so the healing area is not walked on
- Advanced dressings and skin substitute grafts once the blood supply and infection are controlled
Amputation of the toe is sometimes part of that plan, and it is worth saying plainly that a toe removed early, with good circulation restored, is a far better outcome than a foot lost late. Most of the time, the earlier the visit, the smaller the operation, if there is one at all.
Specialized Wound Care at ASG Foot & Ankle
Our board-certified podiatrists treat slow-healing wounds, diabetic foot ulcers, and post-surgical wounds at our three clinics in Homewood, South Chicago Heights, and Mokena.
Is it actually the nail? A black toenail has a long list of mostly harmless causes. Why Toenails Turn Black →
Calves cramping when you walk, feet cold at night? The warning signs of poor circulation that come before a toe changes color. Poor Circulation and Foot Pain: Warning Signs →
Redness spreading, fever, feeling unwell? How a foot infection becomes sepsis, and the signs that mean the emergency department. Sepsis From a Foot Infection →
Burning or numb feet with diabetes? Why the numbness is the part that costs feet. Diabetic Neuropathy and Burning Feet →
Facing a toe amputation? What recovery looks like and how to protect the rest of the foot. Toe Amputation Recovery →
Frequently Asked Questions
Why is my toe turning black without any injury?
Because skin only turns truly black for two reasons: blood has pooled under it, or the tissue has died. With no injury to explain pooled blood, the working assumption has to be that the toe is not getting enough blood, which is called ischemia, and the dark color is tissue starting to die. The usual culprits are narrowed leg arteries from smoking, diabetes, or age, a small clot or piece of cholesterol plaque that has lodged in a toe artery, or a severe infection that has cut off the local blood supply. Less often it is frostbite, a medication effect, or a blood vessel inflammation. None of those are wait-and-see conditions. A toe going dark with no injury should be examined the same day, and the same night if it is also painful, cold, or you have diabetes.
How can I tell if a black toe is a bruise or gangrene?
A bruise has a cause you can name, is purple rather than jet black, is tender to touch, feels the same temperature as the other toes, blanches at least partly when you press on it, and changes color over a week through green and yellow as it fades. Dead tissue does not behave like living tissue: it is black or very dark brown, often with a sharp line between the dark part and normal skin, it is cold, it does not blanch when pressed, and over days it either dries and shrivels or becomes swollen, blistered, and foul-smelling. The single most useful distinction is pain and temperature together. A warm, tender, bruised toe is a bruise. A cold toe that is black and either numb or aching deeply at night is not.
What is the difference between dry and wet gangrene?
Dry gangrene is tissue that died from lack of blood flow without infection. The toe turns dark, becomes cold and hard, dries out, and shrinks, often with a clear line between dead and living tissue. It is serious because it means the artery supply is failing, but it is not usually an overnight emergency, and the priority is restoring circulation so the rest of the foot survives. Wet gangrene is dead tissue that has become infected. The toe is swollen rather than shriveled, may have blisters or weeping, smells bad, the redness spreads up the foot, and the person often feels unwell or feverish. Wet gangrene spreads quickly and can become life-threatening within a day or two. It is an emergency department problem, not a next-available-appointment problem.
Can a black toe be caused by diabetes?
Diabetes is the most common background to a toe turning black, and it does it through three routes at once. It narrows the arteries in the lower leg, so the toes are the first place to lose blood supply. It damages the nerves, so an injury, a blister, or an ingrown nail can turn into a deep infection without the pain that would normally prompt a look. And it weakens the immune response, so infections that would stay small in someone else spread into the tissue and cut off its circulation. That combination is why a black toe in a person with diabetes is treated as a limb-threatening problem from the first visit, and why the workup includes checking the blood supply, probing for infection down to bone, and often imaging, rather than simply dressing the toe.
What is blue toe syndrome?
It is a sudden, painful blue or purple discoloration of one or more toes, often patchy and often with a normal pulse at the ankle, caused by small fragments of cholesterol plaque or clot breaking off from further up the artery tree and lodging in the tiny vessels of the toes. It classically happens in the days after a heart catheterization, vascular procedure, or starting a blood thinner, but it can occur on its own in people with plaque in the aorta or leg arteries. The toe can progress to black and dead tissue if enough of the small vessels are blocked. It matters beyond the toe, because the same shower of debris can reach the kidneys. Blue toe syndrome needs same-day vascular assessment.
Can a black spot on a toe be skin cancer?
Yes, though it looks different from the causes above. Acral lentiginous melanoma is the type that appears on the soles, palms, and under or around the nails, and it is the commonest melanoma in people with darker skin. It is a flat or slightly raised dark brown or black patch, usually painless, with irregular edges and uneven color, that slowly enlarges over months rather than appearing over days. It does not change the temperature of the toe, does not fade, and does not behave like a bruise. Any dark patch on a toe or sole that has been present for weeks, is growing, or has ragged edges should be examined, and a small biopsy settles it.
Will a black toe have to be amputated?
Not necessarily, and the outcome depends heavily on how early the blood supply problem is found. Tissue that is dark but still has some circulation, sometimes called pre-gangrenous or dusky, can recover if the artery is opened by a vascular procedure or the infection is controlled quickly. Tissue that is fully dead cannot be brought back, but the goal shifts to keeping the loss to the dead part only. With dry gangrene and restored circulation, a dead toe tip can sometimes be allowed to separate on its own. With wet gangrene, prompt surgical removal of the dead tissue is what saves the rest of the foot. The single biggest factor in keeping the foot is whether the person came in on day one or day ten.
See a Podiatrist Near You
ASG Foot & Ankle has offices in Homewood, South Chicago Heights and Mokena. Our board-certified podiatrists accept most insurance. Find the office closest to you:
A Toe Going Dark Needs Eyes on It Today
Our wound care clinic in the south suburbs measures the blood supply, checks for infection down to bone, and gets vascular specialists involved the same week when the artery is the problem. No referral needed. If it is a bruise, we will tell you that too.