Treatment of solar keratoses of the extremities with retinoic acid and 5-fluorouracil.

In contrast to solar keratoses of the face, twice daily application of 5% 5-fluorouracil cream was found to be incapable of destroying such lesions situated on the forearms and hands. Twice daily application of 0-1% retinoic acid was also ineffective. Combined use of these agents eradicated keratoses in all twenty subjects with numerous keratoses of the forearms; in only two was the treatment ineffective for keratoses of the hands.