There are a number of potential causes of rashes, including allergies, diseases, reactions, and medications. They can also be caused by bacterial, fungal, viral, or parasitic infections.

Skin rashes can occur from a variety of factors, including infections, heat, allergens, immune system disorders and medications. One of the most common skin disorders that causes a rash is atopic dermatitis (ay-TOP-ik dur-muh-TI-tis), also known as eczema.

Hives appear as a rapidly spreading, red, raised and itchy rash in splotches or all over the body. Caused by an allergic reaction to medications or food, hives can be a sign of a life-threatening problem when accompanied by difficulty breathing and a drop in blood pressure.

Other viral infections that can cause rashes include:

• rubella.
• chickenpox.
• mononucleosis.
• roseola.
• hand, foot, and mouth disease.
• fifth disease.
• Zika virus.
• West Nile virus.

A viral rash is one that occurs due to a viral infection. It can itch, sting, burn, or hurt. The appearance of viral skin rashes can vary. They may appear in the form of welts, red blotches, or small bumps, and they might develop only on one part of the body or become widespread.

There is a condition called chronic idiopathic urticaria (ur-ti-KAIR-ee-uh). Simply put, it means hives that stick around for more than six weeks for no known reason. Many people call it CIU. About 1.5 million people in the U.S. have it.

Previous Rashes However, many rashes aren’t necessarily cured—they’re just controlled and can recur. For example, rashes such as acne, eczema, atopic dermatitis, seborrheic dermatitis, psoriasis, hives, genital herpes, and rosacea can wax and wane, depending on many factors.

Mycosis fungoides usually develops slowly and moves through four phases. But not everyone goes through all of them: First phase: A scaly red rash, usually in areas that don’t get sunlight, such as your rear end; there are no other symptoms in this phase, and it may last months or even years.

Here are some relief measures to try, along with information about why they might work.

1. Cold compress. One of the fastest and easiest ways to stop the pain and itch of a rash is to apply cold.
2. Oatmeal bath.
3. Aloe vera (fresh)
4. Coconut oil.
5. Tea tree oil.
6. Baking soda.
7. Indigo naturalis.
8. Apple cider vinegar.

In many cases, drug rashes go away on their own once you stop taking the drug that caused your rash. If the rash is very itchy, an antihistamine or oral steroid can help manage the itching until the rash clears up. Always talk to your doctor first before discontinuing a drug.

Drug rashes can appear as a variety of skin rashes, including pink to red bumps, hives, blisters, red patches, pus-filled bumps (pustules), or sensitivity to sunlight. Drug rashes may involve the entire skin surface, or they may be limited to one or a few body parts. Itching is common in many drug rashes.

If the rash occurs, the medication should be stopped as soon as possible. The rash may persist for several days to weeks after you discontinue the medication, then it fades. Usually, the rash disappears from the top of the body first and the legs and feet last.

Antibiotics: Oral antibiotics are used to treat many skin conditions. Common antibiotics include dicloxacillin, erythromycin, and tetracycline. Antifungal agents: Oral antifungal drugs include fluconazole and itraconazole.