Infected Skin Tag: Symptoms and When to See a Doctor

A Skin Tag That’s Turned Black

This is the commonest version of “my skin tag is infected” — and usually it isn’t. A skin tag hangs from a narrow stalk that carries a small feeding blood vessel. If the stalk twists, that blood supply is cut off and the tag thromboses: it darkens to purple, red or black, may ache or throb for a day or two, and often drops off by itself. That’s benign. It’s uncomfortable rather than dangerous, and it doesn’t mean anything sinister is happening.

The same thing happens deliberately — and messily — when people tie thread or floss around a tag at home. Instead of dropping off cleanly it often becomes a half-strangled, black, painful lump that stays attached and can then get infected. That scenario is covered in removal gone wrong.

One important caveat, and it’s the reason not to self-diagnose: a dark lesion that was never clearly a stalked skin tag needs examining rather than assuming. A thrombosed tag is benign; a pigmented growth that merely looked tag-like is a different question entirely — see are skin tags dangerous?

Signs of a Genuinely Infected Skin Tag

Real infection has a recognisable pattern — it involves the skin around the tag, not just the tag itself:

• Spreading redness around the base, extending beyond the tag;
• Warmth and swelling of the surrounding skin;
• Pus or discharge, sometimes with a smell;
• Increasing pain or throbbing rather than settling discomfort;
• Bleeding that doesn’t settle, often after the tag was caught or knocked.

Most infections follow an injury: a tag caught on a necklace, a razor, a seatbelt or a bra strap, or a home removal attempt in a non-sterile setting.

Thrombosed or Infected? Telling Them Apart

What We Do About Each

A twisted, thrombosed tag: there are two reasonable options. We can remove it promptly, which gives instant relief from the throbbing, or let it settle on its own if you’d rather wait — it often separates by itself. Either is fine; it depends how uncomfortable it is.

A genuinely infected tag: antibiotics first, then removal once the infection has settled. Operating through actively infected tissue is avoidable and gives a worse result, so the sequence matters.

Removal itself is quick: a small tag is taken by snip excision or hyfrecation under local anaesthetic in seconds, with no stitches; a larger or broad-based tag is formally excised with a dissolvable stitch and the base cauterised. We don’t use freezing for tags — it’s imprecise and risks permanent pale patches, particularly on the neck and in darker skin. Aftercare is simple: keep it lightly moist rather than dry-scabbing, don’t pick it, and use sun protection on a healing mark. Skin tag removal is £200 (each additional £125, consultation £100).

When It’s Urgent

To be clear about the level of urgency: an infected or blackened tag is an urgent review rather than a true emergency. Get seen the same day, or go to urgent care if the clinic is closed, if you have:

• Redness spreading outward from the site (possible cellulitis);
• Fever or feeling generally unwell;
• Significant pus or a rapidly worsening area;
• Heavy or persistent bleeding that doesn’t stop with ten minutes of firm pressure;
• A dark lesion you’re not certain was a simple skin tag — that needs examining, not assuming.

Anyone with diabetes or reduced immunity should have skin infections looked at earlier rather than later, because healing is slower — see skin tag care for diabetics. Book an assessment or call 0203 916 6200.

Why It Happened — and Preventing the Next One

Tags in friction sites get caught, and a caught tag is the usual trigger for both twisting and infection. Practical steps: don’t pick at or tie off a tag, protect ones that catch on jewellery or clothing, avoid shaving directly over them, and — the definitive fix — have troublesome tags removed properly rather than waiting for the next snag. If you have a lot of them, that tendency is worth understanding too; a sudden crop can be a metabolic signal, covered in skin tags and insulin resistance.

Your Questions, Answered

My skin tag has turned black — is it infected?

Usually not. A black tag has most often twisted on its stalk and lost its blood supply (thrombosed) — painful but benign, and it often drops off by itself. Genuine infection shows redness spreading into the surrounding skin, warmth, pus and increasing pain.

Is an infected skin tag an emergency?

It’s an urgent review rather than a true emergency. Get seen the same day if redness is spreading, you have a fever, there’s significant pus, or bleeding won’t settle. A dark lesion that wasn’t clearly a pre-existing tag should be examined rather than assumed.

How is an infected skin tag treated?

Antibiotics first, then removal once the infection has settled — operating through actively infected tissue gives a worse result. A twisted, thrombosed tag is different: it can be removed promptly for instant relief, or left to settle if you prefer.

Can I pull off a black skin tag myself?

No. Pulling or re-tying it risks bleeding and infection, and if the lesion wasn’t a simple tag you also destroy the tissue needed to identify it. Home ligation is the commonest cause of the black, painful, still-attached tags we see.

Do I need antibiotics for an irritated skin tag?

Not for simple irritation or a thrombosed tag — those settle or are removed. Antibiotics are for genuine infection: spreading redness, pus, warmth, increasing pain, or feeling unwell. A clinician can tell the difference in a few minutes.

I have diabetes — should I be more careful?

Yes. Healing is slower and infections are less forgiving with diabetes or reduced immunity, so have any skin infection reviewed earlier rather than later, and avoid home removal entirely.