Which skin cancer is the most commonly diagnosed and tends to grow slowly?

• A. Basal cell carcinoma
• B. Squamous cell carcinoma
• C. Melanoma
• D. Merkel cell carcinoma

Answer: (A)

Basal cell carcinoma is the most commonly diagnosed skin cancer and it typically grows slowly. It arises from the basal cells of the epidermis, is strongly linked to sun exposure, and usually presents as a pearly or waxy lesion with fine blood vessels. Its growth is gradual and it very rarely spreads to distant sites, though it can cause local destruction if left untreated. This slow, locally destructive behavior contrasts with squamous cell carcinoma, which can be more aggressive and is more likely to invade deeper tissues or metastasize; melanoma, though less common, is more dangerous because it can metastasize early; and Merkel cell carcinoma is rare but highly aggressive. So, the combination of high frequency and slow progression makes basal cell carcinoma the best answer.