Any suspicious skin lesion needs to be examined by a doctor who is knowledgeable in making the diagnosis.
The three most common types of skin cancer are Basal cell carcinoma, Squamous cell carcinoma and Melanoma. The first principle treatment of skin cancers is appropriate and early diagnosis as early diagnosis leads to early intervention and better prognosis.
Madan V, Lear JT, Szeimies RM. Non-melanoma skin cancer. Lancet. 2010 Feb 20;375(9715):673-85.