Visiting a health professional is the most definitive way to identify a rash, although Mayo Clinic offers descriptions and images. Atopic dermatitis, pityriasis rosea, drug rashes, miliaria, intertrigo, lichen planus and psoriasis are all itchy skin rashes.
Atopic dermatitis, commonly referred to as eczema, is a chronic condition that brings itchy, inflamed skin, notes Mayo Clinic. It frequently flares up on the arms, limbs, trunk and face, appearing and disappearing intermittently. Pityriasis rosea, occasionally patterned as a Christmas tree, is a fine, itchy and scaly rash. It generally begins on the abdomen, chest or back and spreads to the limbs from there.
A drug rash can result from an allergic reaction to medication or a side effect of a drug, claims Mayo Clinic. It often starts as small red spots that spread throughout the body within one week of taking a medication. Miliaria, also known as heat rash, is characterized by clusters of small, red bumps that produce a prickling or stinging sensation and can be itchy. Overdressing, hot or humid weather, and wearing tight-fitting clothing can lead to heat rash.
Intertrigo is the result of skin-to-skin friction, causing the skin to be painful and sometimes itchy, according to Mayo Clinic. Severe cases can involve bleeding, cracked skin and oozing sores.