Not all skin cancers behave the same way, and understanding the differences can help put a diagnosis — or a concerning spot — into perspective.
Basal Cell Carcinoma
Basal cell carcinoma is the most common form of skin cancer. According to the Skin Cancer Foundation, it typically grows slowly and is unlikely to spread to distant areas of the body, though it can damage surrounding tissue if left untreated. It often appears as a pearly or waxy bump, a flat flesh-colored lesion, or a sore that doesn’t heal.
Squamous Cell Carcinoma
The second most common type, squamous cell carcinoma can appear as a firm red bump, a scaly patch, or a sore that heals and reopens. Compared with basal cell carcinoma, the Skin Cancer Foundation notes it is more likely to spread if untreated, though this risk is still low when caught and treated early.
Melanoma
Melanoma is far less common than the other two but is the most serious, because it has a greater tendency to spread to other parts of the body if not caught early. It often develops from an existing mole or appears as a new dark spot, which is why the AAD’s ABCDE self-check framework focuses so heavily on changing or irregular moles.
Why the Distinction Matters
Treatment approach, urgency, and follow-up all depend on which type of skin cancer is involved, which is why a professional evaluation and, when appropriate, a biopsy are the only reliable way to tell them apart from a photo or self-exam alone.
Learn more about skin cancer screening and treatment at Journelle Skin, or schedule an evaluation for any spot that concerns you.