What should you know about Selsun for ringworm?

Ringworm is a fungal infection, despite its name; it is not caused by a worm. It can produce an expanding, scaly or itchy rash, but other skin conditions can look similar. A selenium sulfide shampoo may have a role in selected fungal problems of the scalp, yet applying it to a body rash without a diagnosis may delay effective care.

Scalp infection can affect hair shafts and may need treatment that reaches beyond the skin surface. Children, people with weakened immunity, and anyone with a rapidly spreading rash need particular care.

Do not use Selsun on the face, genitals, broken skin, or near the eyes unless a clinician specifically advises it. Keep the affected area clean and dry, avoid sharing towels, hats, brushes, or clothing, and wash items that touch the rash. Do not scratch or cover it tightly.

A clinician may recommend [Topical Antifungal Treatment](/treatments/medical-dermatology/topical-antifungal-therapy/) for limited skin infection. Infection of the scalp, nails, or widespread areas may require [Oral Antifungal Treatment](/treatments/medical-dermatology/oral-antifungal-therapy/). Use the selected treatment for the full instructed course.

Arrange prompt medical review for a painful, swollen, oozing, or rapidly enlarging rash, fever, facial involvement, or hair loss from the scalp. Seek urgent help for facial swelling, breathing trouble, or a severe reaction after applying a product. If a [Skin Rash](/symptoms/skin-rash/) or [Scaly Skin](/symptoms/skin-scaling/) area does not improve with the advised treatment, it needs reassessment rather than repeated self-treatment.

Does this look like [Ringworm](/conditions/ringworm/), and is testing needed? Which treatment fits the body site, and should household contacts or pets be checked?