A skin tag that turns black has almost always lost its blood supply. This happens when the tag twists on its narrow stalk, cutting off circulation and causing the tissue to die. It’s one of the most common changes skin tags go through, and in most cases it means the tag is in the process of falling off on its own. That said, a black growth on the skin always deserves a closer look to rule out something more serious.
Why Skin Tags Turn Black
Skin tags hang from the body by a thin stalk called a pedicle, and that stalk contains the tiny blood vessels that keep the tag alive. When a skin tag catches on clothing, jewelry, or skin folds, it can twist on that stalk. The twist pinches off blood flow, and without fresh circulation, a clot forms inside the tag. The trapped blood darkens, and the tissue begins to die. This process is essentially the same thing that happens when any small piece of tissue loses its oxygen supply.
People with obesity or those who have skin tags in high-friction areas like the neck, armpits, or groin are more likely to experience this. The more a tag gets bumped or rubbed, the greater the chance it eventually twists enough to cut off its own circulation. Some skin tags also darken simply with age, even without a dramatic twisting event, as minor, repeated irritation gradually restricts blood flow over time.
What Happens Next
Once a skin tag loses its blood supply, it typically dries out and shrinks over the course of one to three weeks. The color may progress from your normal skin tone to red or purple, then to dark brown or black as the tissue dies. Eventually, the dead tag detaches on its own and falls off, leaving a small spot that heals like a minor wound.
Some mild soreness or tenderness is normal during this process, especially in the first few days after the twist occurs. You might also notice slight swelling at the base. These symptoms usually resolve as the tag dries out. If you see increasing redness spreading beyond the tag itself, significant swelling, warmth, or pus, those are signs of infection rather than normal tissue death.
When a Black Growth Isn’t a Skin Tag
This is the part worth paying attention to. While a blackened skin tag is usually harmless, certain skin cancers can mimic the appearance of a skin tag. Basal cell carcinoma and squamous cell carcinoma can occasionally grow on a narrow stalk and look like a benign tag. And a darkened growth always raises the question of melanoma.
A few features help distinguish the two. A dying skin tag is typically soft, hangs from a clear stalk, and was flesh-colored before it changed. Melanoma tends to have ragged or irregular borders, color that varies throughout the growth (mixing shades of brown, black, tan, or even blue), and it usually sits flat against or slightly raised from the skin rather than dangling. But when a skin tag becomes dark, crusted, or necrotic, even dermatologists sometimes can’t tell the difference by appearance alone. In ambiguous cases, a biopsy is the only way to confirm what the growth actually is.
If a dark growth appeared suddenly, has never looked like a typical skin tag, has an uneven color pattern, or is growing in size, get it checked. The same applies if you’ve had a growth for a while and it changes in a way that doesn’t fit the typical “twisted and dying” pattern described above.
Why You Shouldn’t Remove It Yourself
It’s tempting to snip off a black skin tag or try to speed things along with a home remedy. Dermatologists consistently advise against this. Cutting a skin tag yourself leads to bleeding and carries a real risk of infection, especially in warm, moist areas like the armpit or groin where bacteria thrive.
Popular home treatments don’t fare much better. Apple cider vinegar can cause skin ulcers on the tag and surrounding healthy skin. Over-the-counter freeze kits are often ineffective on skin tags and can burn the tissue around them. Tea tree oil is unlikely to cause harm, but there’s little evidence it actually removes skin tags. The bigger concern with any DIY approach is that you might be treating a growth that isn’t actually a skin tag. Applying caustic remedies to a skin cancer delays proper diagnosis and can make things worse.
If a blackened skin tag is bothering you or you want it gone faster, a dermatologist can remove it quickly with cryotherapy (professional-grade freezing), a small snip, or cauterization. These methods are faster, cleaner, and come with the advantage of having a trained eye confirm what the growth actually is.
Caring for the Skin After a Tag Falls Off
Once a black skin tag detaches, whether on its own or after removal, the spot it leaves behind is essentially a small open wound. Clean the area gently with soap and water twice a day. A thin layer of petroleum jelly covered with a non-stick bandage keeps the wound moist and helps it heal with less scarring. Avoid hydrogen peroxide or rubbing alcohol, both of which slow healing rather than help it.
Most of these spots heal completely within a week or two, leaving little to no mark. Skin tags don’t have deep roots, so the wound is superficial. If the area stays red, weepy, or painful beyond two weeks, that suggests either infection or incomplete removal, and it’s worth having a professional take a look.