What is the most common form of nonmelanoma skin cancer?

Basal cell carcinoma is indeed the most common form of nonmelanoma skin cancer. This type of cancer originates in the basal cells, which are located in the outer layer of the skin (epidermis). Basal cell carcinoma typically arises in areas of the skin that are frequently exposed to UV radiation, such as the face, neck, and ears, making it particularly prevalent among fair-skinned individuals and those with significant sun exposure.

The reason basal cell carcinoma is so common lies in both its association with cumulative sun exposure over a lifetime and its relatively slow growth rate. These tumors usually do not metastasize, meaning they tend not to spread to other parts of the body, which contributes to a lower severity compared to more aggressive skin cancers. While it can still cause significant local damage if untreated, early detection and treatment often lead to excellent prognoses.

In contrast, other forms of skin cancer listed as choices, such as squamous cell carcinoma and keratoacanthoma, are less common, and melanoma, while it is a type of skin cancer, is classified separately due to its higher malignancy and potential for spreading. Understanding this distinction helps clarify why basal cell carcinoma is recognized as the most prevalent form of nonmelanoma skin