An itchy rash on the torso can be caused by many medical conditions, such as chickenpox and eczema, or a reaction to a harsh soap or allergies, according to Healthline. Because skin rashes occur from a variety of factors, individuals should contact their doctor for an official diagnosis.
Chickenpox is a common skin rash that creates red, itchy blisters on the skin. It is typically accompanied by a fever and sore throat, explains Healthline. Rubella, or German measles, is another common reason for itchy rashes. This is a red rash that occurs throughout the body, and symptoms include sore throat, fever, swollen glands, headache and runny nose.
Hives are sudden, red, itchy bumps that are caused by an allergic reaction. As much as 20 percent of the population has experienced hives at some point in their lives. Sometimes rashes are caused by medications, and typically occur right after the medication is taken, or up to several hours later, notes Mayo Clinic. Antihistamines and steroids are the typical treatment for drug rashes.
Eczema, or dermatitis, is another common rash. Eczema causes dry skin and itchiness, resulting in a red rash. Eczema is not contagious, and common causes include detergents, soaps, wool and synthetic fibers. The best treatment for eczema is to avoid fibers and substances to which the skin is sensitive.