My husband has these lines of red bumps all over his side. They itch like crazy and look inflamed. We are scared it’s an infection. What is this?

Discovering a line of red, itchy bumps on one side of the body can be alarming, especially if they seem to appear suddenly or become increasingly inflamed. While several skin conditions can cause this type of rash, the location, pattern, and accompanying symptoms often provide important clues about the underlying cause.

Although only a healthcare professional can make an accurate diagnosis, understanding the possibilities can help you recognize when it’s time to seek medical attention.

One Possible Cause: Shingles

One of the most common conditions that causes a painful or itchy rash on one side of the body is shingles, also known as herpes zoster. Shingles develops when the virus that causes chickenpox becomes active again years after the original infection.

The rash usually appears as a band or stripe on one side of the chest, abdomen, back, or face. Early symptoms often include:

• Burning, tingling, or itching
• Pain or sensitivity to touch
• Red patches that develop into clusters of fluid-filled blisters
• Crusting over after several days

Shingles typically affects only one side of the body because the virus travels along a single nerve pathway.

Could It Be Contact Dermatitis?

Another possibility is contact dermatitis, a skin reaction that occurs after touching an irritant or allergen. Common triggers include certain plants, soaps, detergents, fragrances, fabrics, or chemicals.

Symptoms may include:

• Red, itchy bumps
• Swelling
• Dry or blistered skin
• Rash limited to the area that touched the irritant

Unlike shingles, contact dermatitis is usually related to recent exposure rather than a viral infection.