A rash is a noticeable change in the skin's appearance, often characterized by redness, swelling, or irritation. It can occur due to various factors, including allergies, infections, or skin conditions like eczema or psoriasis. Rashes can appear anywhere on the body and may be itchy, painful, or cause discomfort. Treatment for a rash depends on its cause. Over-the-counter creams or ointments, such as hydrocortisone, can help reduce inflammation and itching. In some cases, a doctor may prescribe medication if the rash is severe or caused by an infection. Keeping the affected area clean and dry is also important for healing.