Red Spot on Skin: When It Could Be Cancer
Red spots on the skin have many causes, the vast majority of them benign — cherry angiomas, broken blood vessels, irritation, eczema, and inflammation. A small but meaningful share of red lesions, however, are skin cancer. Basal cell carcinoma, squamous cell carcinoma, and amelanotic melanoma all commonly present as red or pink areas that people initially dismiss. This guide walks through what's harmless, what's suspicious, and what should send you to a dermatologist this week.
Common harmless red spots
Cherry angioma. Bright cherry-red, dome-shaped, 1-5mm. Multiple lesions, increase with age. Blanch with pressure. Completely benign.
Petechiae. Tiny flat red or purple dots, usually multiple, caused by leaked blood from capillaries (after coughing, vomiting, exertion, or sometimes blood disorders). Do not blanch with pressure (distinguishing them from other red spots). If many appear suddenly without an obvious cause, see a doctor — but they are not skin cancer.
Spider angioma. A central red dot with thin radiating vessels. Common on the face and chest, especially in pregnancy or with liver disease. Benign.
Irritation, friction, or contact reaction. A red patch from clothing rubbing, an allergen, or recent shaving. Resolves within days when the trigger is removed.
Eczema or dermatitis patch. Red, often itchy, sometimes scaly. Multiple lesions; flares and remits.
Insect bites. Red papules, often itchy, in lines or clusters. Resolve over days to a week.
Red lesions that are usually skin cancer
Basal cell carcinoma (BCC). The single most common skin cancer worldwide. Often a pearly pink or red papule with visible small blood vessels on the surface (telangiectasia) and a rolled, slightly raised border. May have a central crater that bleeds and scabs over and over. Most common on the face, ears, scalp, neck, and upper trunk. Slow-growing.
Squamous cell carcinoma (SCC). A red, scaly, or crusted patch or nodule. Sometimes tender. May ulcerate. Often arises in sun-damaged skin or from a precancerous actinic keratosis. Common on the face, lips, ears, scalp, and backs of hands.
Amelanotic melanoma. Red or pink, often raised and firm. Grows steadily. May ulcerate. Less common than BCC and SCC but more dangerous if missed.
Merkel cell carcinoma. Rare but aggressive. A firm, painless red, pink, or violet nodule that grows rapidly, usually on sun-exposed skin in older adults.
Kaposi sarcoma. Red, purple, or brown patches or nodules, usually on the legs or in immunocompromised individuals.
Notice that all of these share a small set of features: persistence, growth, bleeding, or ulceration that does not heal.
The 'sore that won't heal' pattern
If there is one feature on this page worth memorising, it is this: a sore on the skin that does not heal within 4 weeks should be evaluated by a dermatologist.
This pattern catches more skin cancers than any other single self-screening rule. It applies across all subtypes — BCC, SCC, amelanotic melanoma, and Merkel cell carcinoma all commonly present as 'a spot that scabs over, falls off, and comes right back'. The cycle of ulceration and partial healing creates the characteristic non-healing wound.
Time your spot. If it has been the same lesion for 4 weeks without fully healing, that is a referral, not a wait-and-see.
When a red spot needs dermatology this week
Book within 1-2 weeks if you have a red lesion that: has not healed in 4+ weeks; is bleeding repeatedly without injury; is growing steadily over weeks; is firm and indurated rather than soft and inflamed; is pearly or has visible surface blood vessels; is on chronically sun-exposed skin in an older adult.
Book urgently (within days) if: a red lesion is growing rapidly week to week; you have a personal history of skin cancer and a new persistent red spot; you are immunosuppressed (organ transplant, chemotherapy, certain medications) and have any new growing lesion.
When you can reasonably wait and watch
Reasonable to wait 4-6 weeks if you have a red spot that is: small (<5mm), flat or only slightly raised, soft, not bleeding, in a typical location for benign lesions (cherry angioma on the trunk, friction redness from clothing), and you have no major skin cancer risk factors.
Photograph it with a coin for scale and a date. Re-check at 4 weeks. If it is unchanged or smaller, the wait was justified. If it has grown, changed shape, started bleeding, or developed any new features — convert to a dermatology visit.
Monitoring is not a substitute for a visit when warning signs are present. It is the safe option when warning signs are absent.
What dermatologists do with a red lesion
Examination by naked eye and dermatoscope. The dermatoscope is essential for red lesions because the vascular pattern under magnification distinguishes most benign from malignant cases. Specific patterns (atypical vessels, glomerular vessels, milky-red areas) point to specific cancers.
If the lesion is clearly benign on dermoscopy (cherry angioma, spider angioma), no further action is needed. If there is uncertainty or a suspicious pattern, the dermatologist will biopsy — usually a shave or punch biopsy under local anaesthetic, taking 5-10 minutes. Results in 1-2 weeks. Most red-lesion biopsies come back benign. The biopsy exists for the share that do not.
Use our free ABCDE checker for any spot that worries you. For red lesions, the most important rule is the 4-week non-healing test — any sore that has not closed up in 4 weeks deserves a dermatologist visit, regardless of how it looks.
Start free ABCDE checkSources
Content based on clinical guidelines from the American Academy of Dermatology (AAD), British Association of Dermatologists (BAD), and peer-reviewed literature from JAAD, BJD, and JAMA Dermatology. Epidemiological data from NCI SEER and IARC GLOBOCAN. Full methodology