Appearance highly variable
Slow growing
Non-healing papule, plaque, or ulcer<unk> aling, bleeding, crusty
On sun-exposed area of skin
Squamous cell carcinoma
Basal cell carcinoma
Kaposi's sarcoma
Melanoma
Juvenile nasopharyngeal angiofibroma
Seborrheic keratosis
Eumycetoma
Bullosis diabeticorum