: A substance that helps protect the skin from the sun's harmful rays. Sunscreens reflect, absorb, and scatter both UVA and UVB radiation. Using lotions, creams, or gels that contain sunscreens can help protect the skin from premature aging and damage that may lead to skin cancer.

: A procedure to remove or repair a part of the body or to find out whether disease is present.

(kee-mo-THER-a-pee): Treatment with anticancer drugs in a lotion or cream applied to the skin.

(TOO-mer): An abnormal mass of tissue that results from excessive cell division. Tumors perform no useful body function. They may be benign (not cancerous) or malignant (cancerous).

(TOO-mer ne-KRO-sis): A type of biological response modifier (a substance that can improve the body's natural response to disease).