McDermott says that he started seeing a dermatologist when he was in his 20s at the recommendation of his parents.

The lowest part of the epidermis, the basal layer, is formed by basal cells. These cells continually divide to form new cells to replace the older ones that wear off the skin's surface.

Basal cell carcinoma is a skin cancer that starts in the basal cell layer of the skin. The basal cell layer is the lower part ...