Which of the following is the most prevalent type of primary skin cancer?

Basal cell carcinoma is recognized as the most prevalent type of primary skin cancer. It accounts for the majority of non-melanoma skin cancers, representing more than 80% of skin cancer cases. This cancer arises from the basal cells, which are located in the lower part of the epidermis. The incidence of basal cell carcinoma is significantly higher than that of other skin cancers due mainly to increased sun exposure and UV radiation, which play a critical role in its development.

In contrast, while squamous cell carcinoma and melanoma are also important types of skin cancer, they occur less frequently than basal cell carcinoma. Squamous cell carcinoma is the second most common form but does not surpass the prevalence of basal cell carcinoma. Melanoma, although more aggressive and potentially lethal, is less common than the aforementioned types. Merkel cell carcinoma is even rarer, classified as neuroendocrine skin cancer with a much lower incidence rate compared to the other types.

This high prevalence of basal cell carcinoma emphasizes the need for regular skin checks, education on sun protection measures, and awareness of skin changes to promote early detection and treatment.