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Irritating Skin Rashes: 13 Possible Causes. Not typically serious, but always irritating and embarrassing, skin rashes can be caused by a number of factorsâsuch as environment, infection, stress, heat, allergens, immune system disorders, and medication.
1 Eczema, or atopic dermatitis, is a rash that primarily occurs in people with asthma or allergies. The rash is often reddish and itchy with a scaly texture.  Psoriasis is a common skin condition that can cause a scaly, itchy, red rash to form along the scalp, elbows, and joints.