Why your sweater might be giving you a rash

Is your sweater causing you simple skin irritation or is inducing an allergic reaction? (Images: Instagram/Alia Bhatt, Marie Claire)

In winter, sweaters become a wardrobe essential. But for some people, wearing one directly over bare skin can cause itching, redness, or rashes. But why does this happen? Dr Sunil Kumar Prabhu, Consultant – Dermatology, Aster RV Hospital, explains that sweaters can indeed lead to skin rashes, but not always. “Some individuals do complain of skin rashes when they wear sweaters directly on their skin,” Dr Prabhu tells indianexpress.com, adding that one of the most common reasons is simple mechanical irritation.

Rough fibers, especially wool, can rub against the skin and “lead to redness, itching or the development of a rash.” People with sensitive skin, eczema, or dry skin are particularly prone to this reaction, he says.

Dr Prabhu notes that “there are also other individuals who suffer from allergic contact dermatitis to wool, dyes, or chemicals that are used in fabric processing.” In addition, sweaters can trap heat and sweat, creating “a favourable environment for the growth of bacteria and fungi,” which may result in heat rash or infections, especially in hot and humid weather.

Some people also suffer from allergic contact dermatitis to wool, dyes, or chemicals that are used in fabric processing (Image: Wikimedia Commons)

Not all rashes are the same. Simple irritation usually appears “immediately after wearing rough or tight clothing,” remains limited to the area of contact, and settles quickly once the sweater is removed. The skin may feel itchy or prickly but “usually goes back to normal in a few hours.”

An allergic skin reaction, or contact dermatitis, behaves differently. It “usually develops after repeated exposure,” causes intense itching, redness, swelling, or even tiny blisters, and may spread beyond the contact area. Such rashes “take a longer time to heal” and often worsen with repeated exposure.

For people with sensitive or eczema-prone skin, prevention is key. Dr Prabhu advises keeping skin protected by wearing “a cotton inner layer under the sweaters” and choosing softer options like fine merino wool, cotton blends, bamboo, or fleece. Washing new sweaters before use helps remove dyes and chemicals, while moisturizing strengthens the skin barrier. He also warns against overheating or sweating, as these can trigger rashes. If itching or redness appears, it’s best to “take off the sweater immediately to avoid worsening the skin irritation.”

DISCLAIMER: This article is based on information from the public domain and/or the experts we spoke to. Always consult your health practitioner before starting any routine.