A rash is an area of skin that has a noticeable change in texture and/or color, and is irritated, swollen, itchy and/or painful. Rashes are a symptom of many different medical conditions, from allergies to poison ivy to an adverse reaction to heat. A rash is an area of skin that is irritated, inflamed or swollen. Rashes can occur due to various causes. Discover 36 common skin rashes. There are many types of rashes. Causes of a rash include contact dermatitis, viruses, and autoimmune conditions. This article provides images to help identify a rash. The basics on some common types of skin rashes, including eczema, granuloma annulare, lichen planus, and pityriasis rosea. Out of more than 3,000 skin diseases, how do you know what condition you have? These 23 skin rash pictures and expert tips can help you decipher your skin. A rash, or dermatitis, is an area of irritated or swollen skin. It can be itchy, red, and painful. Learn about the types, causes, and treatments. Overview Dermatitis is a common condition that causes swelling and irritation of the skin. It has many causes and forms and often involves itchy, dry skin or a rash. Or it might cause the skin to blister, ooze, crust or flake. Three common types of this condition are atopic dermatitis, contact dermatitis and seborrheic dermatitis. Atopic dermatitis is also known as eczema. Skin rashes, or red, bumpy, often itchy skin, has many causes including viruses, bacteria, allergens and skin conditions like eczema and psoriasis. Skin rashes can be caused by minor irritations or allergies, while others are more serious. When to go to a dermatologist for a skin rash See a dermatologist if your rash is persistent, keeps coming back, doesn’t improve with standard treatment, or affects sensitive areas, such as the face, eyes, mouth, or genitals.