A stray cat has small red spots on its front leg with no fur around them; what is it?

Red spots on the skin signal a skin disease, and many types exist. At home, use a Wood’s lamp on the area; a green fluorescent reaction suggests ringworm. If unsure, get a skin scraping at a hospital to confirm the type before medication.

Generally treat skin disease with an E-collar to prevent licking poison and spreading, shave and disinfect the area with iodine, remove scales and scabs, then apply the right medicine; for ringworm use antifungal spray and ketoconazole ointment. Keep the environment dry and clean.