a. Explain why squamous cell carcinoma has a better prognosis than malignant melanoma.
b. List skin disorders to which exposure to sunlight is a predisposing factor.
c. List the signs of possible malignant changes in a skin lesion.
d. Compare the characteristics of the typical lesion of squamous cell carcinoma, melanoma, and Kaposi's sarcoma.
e. List the four warning signs of skin cancer.