Treatments for skin rashes in adults range from hydrocortisone ointments and steroid creams to antihistamines and mild sunlight exposure, according to WebMD. The most common skin rashes among adults are atopic eczema, granuloma annulare, lichen planus and pityriasis rosea.
Atopic eczema cannot be cured, but over-the-counter medications can treat the symptoms, states WebMD. Hydrocortisone helps to control itching and swelling, although prescription medication is available for severe cases. One treatment option uses phototherapy with ultraviolet light. Individuals with atopic eczema should avoid stress, allergens and skin irritants that can trigger flare-ups. Granuloma annulare resolves itself over time without treatment, although ointments and ultraviolet light can control the symptoms.
Lichen planus is a condition that produces itchy rashes with shiny bumps, explains WebMD. The symptoms can be treated with antihistamines and steroid injections. Antihistamines and moderate amounts of ultravilet light or sunlight exposure can also be used to treat pityriasis rosea.
Some rashes occur because of an allergic reaction, the presence of an irritant, or dry skin, Fairview Health Services explains. The cause of the rash, such as the allergen or irritation, needs to be removed. An individual can then treat it with soothing baths and moisturizing cream, then avoid harsh detergents and soaps.