Most cases of ringworm can be treated with antifungal creams or ointments with few side effects, but some patients report mild stinging, according to WebMD. However, if left untreated, the ringworm rash can become painful.
When using antifungal creams to treat ringworm, it is important to use the medication according to the product instructions even if the rash clears up quickly, as WebMD explains. The infection may still be present after the rash disappears, and discontinuing treatment may cause the rash to return. Treatment may take two to four weeks, but patients are advised to contact their doctor if the rash does not improve within two weeks.