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Eczema is an irritating, itchy rash on the skin. Hives can be very itchy. Wearing tight, scratchy clothing may cause an itchy rash. Contact with poison oak may result in an itchy rash.Allergies may manifest as skin rashes. It is important to keep a rash that has developed as a result of antibiotics as clean and as dry as possible. A topical cream can be applied to alleviate itchy skin.czema is an irritating, itchy rash on the skin. Hives can be very itchy. Wearing tight, scratchy clothing may cause an itchy rash. Contact with poison oak may result in an itchy rash.
Rashes Caused By Allergies. Hives. The most common allergic rash is hives, an extremely itchy rash that consists of raised large welts on the surface of the body, often circular with a pale center. Hives can result from an allergic reaction to medicines, foods, viral infections, or insect stings and bites. For localized itchy rashes, apply 1% hydrocortisone cream if the rash is not a result of fungus, chicken pox, or bacterial infection. 2  If your child has just started taking a new medicine, and develops a rash, consult your physician immediately.