Human papillomavirus (HPV) is ubiquitous in skin and has been linked with nonmelanoma skin cancer. Human papillomaviruses (HPVs) consists of more than 200 related viruses. More than 40 HPV types can be easily spread through sexual contact, contact from the skin and mucous membranes of infected people.

Learn about skin cancer basics

Three main layers of the skin are - epidermis, dermis, and subcutis.

Melanoma is the most serious type of skin cancer. It develops in the cells (melanocytes) that produce melanin (pigment that gives your skin its color). Melanoma can also develop in eyes and, rarely, in internal organs, such as the intestines.

Basal cell carcinoma is a skin cancer that grows on parts of your skin that get a lot of sun.

Lentigo maligna is an early form of melanoma in which the malignant cells are confined to the tissue of origin, the epidermis. It is often reported as 'in situ' melanoma.

Changes in the existing moles or new moles can be a sign of skin cancer. Doctor may want to remove them in some cases if there is a risk of cancer.