What if a rash doesn't go away?
You should see a dermatologist for any rash that doesn't go away with over-the-counter medicine, he says. Typical treatments include: Topical cortisone, especially if you have a mild case. Immunosuppressive drugs (such as cyclosporine or methotrexate) for more moderate to severe cases. What happens if a rash doesn't go away? Call Your Doctor If:Home treatment doesn't help or the itch lasts more than a couple of weeks. The itch comes on suddenly and is all over your body.