Red Spot on Skin: When It Could Be Cancer

Cherry angioma. A small, smooth, bright red bump made of tiny blood vessels. Most adults collect a few as they get older. Harmless.

Spider angioma. A red dot in the center with fine vessels spreading out from it like legs, most often on the face and upper chest.

Irritation or a contact reaction. A red patch where clothing rubs, where a new product touched the skin, or where you've just shaved. It fades within days once the trigger is gone.

Eczema. Red, itchy, sometimes scaly patches that come and go, usually in more than one place.

Insect bites. Itchy red bumps, often in a group or a line, that fade over a week or so.

Press the side of a clear drinking glass firmly against the spot. Spots made of widened blood vessels usually fade, at least partly, under the pressure. Tiny flat red or purple dots that don't fade are bleeding just under the skin; doctors call them petechiae.

A few petechiae after a hard bout of coughing or vomiting usually have a simple explanation, but new ones with no obvious cause should be checked by a doctor. A rash of them that spreads quickly, especially if you or your child feels unwell, is an emergency. The NHS uses this same glass test for meningitis and says to call an ambulance or go to the emergency department ^[1]. These spots are not skin cancer, but they can't wait.

For a red spot you're unsure about, our skin cancer checker describes what is visible in a photo and suggests a next step. It is paid and does not diagnose.

Basal cell carcinoma (BCC). The most common skin cancer ^[2]. It can be a shiny pink or red bump, a scaly patch, or a sore that heals and then comes back, most often on the head and neck ^[2]. It grows slowly and rarely spreads ^[2].

Squamous cell carcinoma (SCC). A rough, scaly patch, a firm red dome-shaped growth, or a sore that bleeds, or heals and comes back, usually on sun-exposed skin such as the face, scalp, arms, hands and lower legs ^[3]. Left alone it can grow deep, and occasionally it spreads ^[3].

Bowen disease (SCC in situ). A flat, scaly, orange-red patch that can grow to several centimeters, most often on the ears, face, hands and lower legs of people with a lot of past sun ^[4]. It can look like a patch of eczema or psoriasis. The clue is a single patch that stays put and doesn't clear with the creams that settle eczema.

Amelanotic melanoma. A melanoma with little or no pigment, so it looks pink, red or skin-colored. It is much less common than BCC or SCC but more dangerous if missed; our guides on pink moles and amelanotic melanoma cover it.

What these spots share is how they behave. They persist, grow slowly, scale, or bleed and crust without healing.

Write down the date you first noticed the spot. If it's a sore, a crust or a scaly patch and it still hasn't healed four weeks later, book a doctor. Don't wait to see if it clears. The NHS lists a spot that hurts, itches, bleeds, crusts or scabs for more than four weeks as a reason to get checked for skin cancer ^[5].

The rule matters most for red spots because the cancers above often pass for something minor, like a scratch, a bite or a dry patch. What gives them away is that they never quite go.

Take a photo of the spot today with a coin or ruler next to it, so in four weeks you are not relying on memory.

See a doctor today: new red or purple dots that don't fade under a glass and are spreading quickly, especially if someone feels unwell. Call an ambulance or go to the emergency department ^[1].

Book within 2 weeks: a red sore, crust or scaly patch that hasn't healed after four weeks; a red spot that bleeds without being injured; a firm red bump that keeps growing over weeks; or any new, growing red spot if you've had skin cancer before or take medicines that suppress the immune system, for example after an organ transplant. UK guidelines tell GPs ^[3] to consider an urgent suspected-cancer referral for a lesion that suggests SCC ^[6].

Book in the next few weeks: a shiny or pearly red bump that is growing slowly and isn't bleeding, or a single scaly patch that hasn't responded to eczema cream. UK guidelines refer suspected BCC non-urgently, because it grows slowly ^[6].

Mention it at your next check-up: small bright red dots you've had for years, or a patch that comes and goes with irritation.

They'll look at it closely and through a dermatoscope, a handheld magnifier with its own light. For red spots the pattern of blood vessels under magnification is especially telling, and a cherry angioma looks quite different from a basal cell carcinoma.

If the spot is clearly harmless, that's the end of it. If there is any doubt, they'll take a small biopsy under local anesthetic, usually a shave or a punch, and send it to the lab. If it turns out to be BCC, SCC or Bowen disease, the AAD notes that treating squamous cell carcinoma soon after diagnosis gives the best chance of a cure ^[3].