What causes small blisters on hands without itching in hot weather?

Small blisters on the hands during hot weather that do not itch may be caused by tinea manuum, dyshidrotic eczema, or hand-foot-and-mouth disease. It is recommended to visit a hospital for diagnosis to determine the exact cause.

1. Tinea Manuum

Tinea manuum can be triggered by fungal infections from dermatophytes such as Trichophyton mentagrophytes, Microsporum gypseum, Trichophyton rubrum, and Epidermophyton floccosum. This condition may result in small, non-itchy blisters on the hands during hot weather, along with symptoms like dry, cracked skin.

2. Dyshidrotic Eczema

Dyshidrotic eczema is a blistering skin disorder commonly affecting the palms, soles, and sides of fingers and toes. It is associated with factors such as exposure to irritants, prolonged sunlight, and living frequently in warm, humid environments. It typically causes small, non-itchy blisters on the hands during hot weather; some patients may also experience skin peeling or pain.

3. Hand-Foot-and-Mouth Disease

Hand-foot-and-mouth disease occurs due to transmission of enteroviruses, often through consuming contaminated food or water, or contact with items previously used by infected individuals. It can lead to small, non-itchy blisters on the hands during hot weather, and may also be accompanied by symptoms such as loss of appetite and cough.