Ringworm on the arm: treatment and care

Arm ringworm is a fungal infection in the outer skin. It may begin as an itchy, dry, scaly patch and expand with a more noticeable edge, sometimes leaving clearer skin toward the centre. A skin rash is a common presentation of ringworm, although eczema, contact irritation, and other rashes can resemble it. A clinician may diagnose it by examining the border and checking whether the appearance fits a fungal infection.

The treatment plan depends on how much skin is involved, whether the rash is near a joint or hand, and whether it has returned. Steroid-only creams can hide the appearance while allowing fungus to persist, so avoid self-treating an uncertain rash with them.

Use the prescribed antifungal exactly as directed and keep the arm clean and dry. Wash hands after touching the rash, do not share towels or clothing, and launder items that contact the area. A clinician may recommend [Topical Antifungal Treatment](/treatments/medical-dermatology/topical-antifungal-therapy/) for a limited skin infection; broader, recurrent, or difficult-to-treat disease may need [Oral Antifungal Treatment](/treatments/medical-dermatology/oral-antifungal-therapy/).

Seek care promptly if the rash is painful, hot, rapidly enlarging, draining, or accompanied by fever. Arrange a review if it involves the face, hands, or nails, if several household members have similar symptoms, or if it is not improving after the advised treatment period. A clinician can reassess the diagnosis instead of escalating the wrong product.

Ask how long to use the medicine, whether the rash needs a sample, how to protect other people at home, and what to do if the skin becomes irritated. Tell the clinician about previous antifungal or steroid use, allergies, pregnancy, and medicines taken for other conditions.