What is the most prevalent type of skin cancer?

Basal cell carcinoma is the most prevalent type of skin cancer, accounting for the majority of skin cancer cases. This type of carcinoma arises from the basal cells, which are located in the lower part of the epidermis. Basal cell carcinoma is typically caused by prolonged exposure to ultraviolet (UV) radiation from the sun, leading to mutations in the basal cells. It usually manifests as a small, shiny bump or a sore that doesn't heal and is often found on sun-exposed areas of the body like the face and neck.

The key aspect of why basal cell carcinoma is the most prevalent lies in its frequency, as it often occurs in individuals with fair skin who have had significant sun exposure. Moreover, it generally has a slower growth rate and is less likely to metastasize than other skin cancers, such as melanoma. This allows for earlier detection and treatment, contributing to its prevalent status among skin cancer types.

In contrast, melanoma and squamous cell carcinoma, while serious and potentially life-threatening, occur less frequently. Merkel cell carcinoma is even rarer compared to these three and represents a small fraction of skin cancers. Therefore, when discussing the prevalence of skin cancer types, basal cell carcinoma stands out due to its high incidence in the population.