Which type of skin cancer is the most common and least severe?

Basal cell carcinoma is acknowledged as the most common type of skin cancer, accounting for a significant majority of skin cancer cases diagnosed each year. It originates in the basal cells, which are located in the lowest layer of the epidermis. One reason basal cell carcinoma is considered the least severe is that it tends to grow slowly and rarely spreads to other parts of the body (metastasizes). This characteristic allows for a high success rate in treatment when caught early, often requiring simple surgical removal.

In contrast, squamous cell carcinoma is more aggressive and can also metastasize, while melanoma, though it is less common than the other types, is the most serious due to its potential for rapid spread and high mortality rate. An atypical mole is not classified as a skin cancer but rather a potentially precancerous lesion that could indicate a risk for developing melanoma.