For more information on common types of skin cancer go here.
Epidermoid cysts are not true neoplasms. They form from occluded hair follicles.
Warts (verruca vulgaris)are common papillary growths of epidermis cause by papilloma virus infection.
Seborrheic keratosis is a non-cancerous growth of the epidermis. They are not premalignant.
Actinic keratosis is an early stage of skin cancer. They can be considered squamous carcinoma in situ.
Keratoacanthoma a common and generally considered benign tumor of sun-exposed skin.
Basal cell carcinoma is the most common skin cancer. It arises from basal cells and is associated with exposure to sunlight. It does not usually metastasize but can destroy surrounding skin.
Squamous cell carcinoma is a malignant tumor of epidermal cells (keratinocytes). Photos and more information here.