What changes in the skin may point to skin cancer?

Key skin changes that may indicate skin cancer include asymmetry, irregular borders, color variations, diameter changes, and evolving characteristics, as outlined by the American Cancer Society's ABCDE rule for melanoma detection.

The ABCDE method provides a systematic approach to identifying potentially cancerous skin changes. A stands for Asymmetry, where one half of a mole or spot doesn't match the other half. B represents Border irregularity, indicating edges that are uneven, scalloped, or poorly defined. C refers to Color variations, including multiple shades of brown, black, red, white, or blue within a single lesion.

D indicates Diameter, with spots larger than 6 millimeters (about the size of a pencil eraser) requiring attention, though melanomas can be smaller. E stands for Evolving, meaning any change in size, shape, color, elevation, or new symptoms like bleeding, itching, or crusting.

Beyond the ABCDE criteria, other concerning changes include new growths that appear after age 30, sores that don't heal within four weeks, and spots that look significantly different from other moles on your body. According to the Skin Cancer Foundation, basal cell carcinomas may appear as pearly or waxy bumps, flat flesh-colored lesions, or bleeding sores that heal and return.

Squamous cell carcinomas often present as red, scaly patches, open sores, or raised growths with a central depression. These cancers typically develop on sun-exposed areas including the face, ears, neck, lips, and backs of hands.

Pay special attention to changes in existing moles or freckles, particularly those that become tender, itchy, or develop a different texture. New pigmented lesions that appear suddenly or grow rapidly also warrant professional evaluation.

Risk factors that increase vigilance include fair skin, history of sunburns, excessive UV exposure, family history of skin cancer, and having many moles or atypical moles. People with these risk factors should perform monthly self-examinations and schedule annual professional skin screenings.

Early detection significantly improves treatment outcomes, with five-year survival rates exceeding 99% for melanoma caught in early stages. If you notice any suspicious changes, schedule an appointment with a dermatologist promptly for professional evaluation and potential biopsy.

Related: Cancer Awareness & Symptoms · When should persistent, unexplained symptoms be investigated further? · What questions should someone ask after an abnormal screening test? · How do sun habits affect melanoma risk?