What causes blisters on the feet when the weather gets hot?

Developing blisters on the feet when the weather gets hot may be caused by conditions such as tinea pedis (athlete's foot), eczema, or hyperhidrosis. It is recommended to seek medical attention at a hospital to determine the specific underlying cause of the symptoms.

1. Tinea Pedis

Tinea pedis is usually caused by fungal infections, such as Trichophyton mentagrophytes, Trichophyton rubrum, or Epidermophyton floccosum. The infection spreads primarily through close contact or autoinoculation, leading to skin lesions, blisters, moist and macerated skin, erosion, and the development of blisters on the feet in hot weather. These symptoms commonly affect areas including the soles, heels, spaces between toes, and lateral edges of the feet.

2. Eczema

Eczema can be triggered by excessive physical fatigue, mental stress, or exposure to irritants such as animal fur, pollen, or ultraviolet radiation. This condition causes inflammatory reactions in the epidermis and upper dermis, resulting in blisters on the feet when temperatures rise, accompanied by symptoms such as redness, swelling, and intense itching.

3. Hyperhidrosis

Hyperhidrosis may be induced by autonomic nervous system dysfunction or endocrine disorders, leading to abnormally increased sweating on localized or generalized areas of the skin even under normal temperature and environmental conditions. This excessive perspiration can subsequently result in blister formation on the feet in hot weather and episodes of profuse sweating.