The Short Answer
Red flags for skin cancer include rapid growth (weeks to months), irregular or jagged borders, mixed colors (brown, black, red, white), bleeding or oozing, and itching or tenderness. If your bump shows any of these signs, see a dermatologist within 1–2 weeks for urgent evaluation [1].
Benign adenomas grow slowly (over months to years), have smooth, uniform appearance, and rarely bleed or itch. Skin cancers like melanoma or squamous cell carcinoma grow faster, have irregular borders, show color variation, and may bleed or become tender. The ABCDE rule (Asymmetry, Border irregularity, Color variation, Diameter >6 mm, Evolving/changing) helps you spot concerning lesions [1].
Sun exposure increases your risk of skin cancer but not adenomas. If you have a history of sunburns, use tanning beds, or have fair skin, you are at higher risk for melanoma and should have any new or changing bump evaluated promptly. Your dermatologist can distinguish adenoma from cancer using dermoscopy and biopsy if needed [1].
Most adenomas are completely benign and never become cancer. However, if you notice your bump changing size, color, or texture, or if it starts bleeding or itching, schedule a dermatology visit within 1–2 weeks. Early evaluation gives you peace of mind and ensures any concerning lesion is caught early [1].
Try This Today
Use the ABCDE rule as your monthly self-check: Asymmetry (one half different from the other), Border irregularity, Color variation, Diameter >6 mm, Evolving (changing). If your bump fails any of these tests, photograph it and call your dermatologist—do not wait.