Question: what are rare skin cancers?
Answer: Kaposi sarcoma (KS) iscaused by human herpesvirus 8, also known as Kaposi sarcoma associated herpes virus. ... 
Actinic keratosis is a pre-cancerous growth that may develop into squamous cell carcinomas if left untreated. ... 
Lymphoma of the skin, or cutaneous lymphoma, is a type of non-Hodgkin lymphoma.