Depending on what’s causing your rash, your primary care physician may suggest different treatment options. Potential treatments include:   • Allergy medications, such as oral antihistamines, to reduce itching • Anti-inflammatory or hydrocortisone creams to reduce inflammation and itching • Immunosuppressants for rashes caused by eczema or an immune system response • Colloidal oatmeal baths to relieve dry skin and itchy skin rashes • Topical steroid creams to ease inflammation and/or itchiness • Topical immunomodulators to reduce the immune system’s response to allergens.   Depending on the severity of your condition and how your body responds to treatment, it can take anywhere from a few days to several weeks for a rash to diminish. If your rash is caused by a medical condition, treating the underlying cause will often result in the rash lessening and/or disappearing. However, in some specific conditions, rash marks may not fade.   Your physician will be able to provide more insight into your skin treatment or they may choose to refer you to a dermatologist for a more specialized form of medical care.