Sweat Irritation is also referred to as heat rash. Heat rash can occur in areas where skin touches skin, such as under the breasts, on the inner thighs, and the underarms. Sweat irritation can develop when the sweat duct in the skin becomes clogged.
When this occurs, perspiration becomes trapped and can trigger irritation, itching, and a rash. The heat rash appears as reddened skin with blisters due to inflammation.
Sweat irritation also occurs in the skin areas of tight clothing where there’s lack of air circulation. Sweat irritation is also caused by hot and humid conditions and tight fitting clothing.