Common causes of clear bumps on the palms of the hands include herpes sweat, tinea cruris and other diseases. 1. herpes sweat: this disease is a type of eczema, the etiology is unknown, may be related to chronic infection, endocrine and metabolic changes, genetics, neuropsychiatric factors, etc., the skin lesions manifested as deep in the small blisters of the size of a pinprick to a grain of corn, containing clear or turbid pulp, blisters can be fused into large blisters. 2. ringworm: this disease is mainly caused by red ringworm, ringworm fungi, plaster-like sporotrichum and flocculent epidermal fungi and other fungal infections, this disease is mainly transmitted through contact, preferably in the interphalangeal and palm, lesions manifested as a deep in the blisters of the size of a pinpoint, blister fluid clear, thick wall and shiny, not easy to break and other symptoms. It is recommended that patients go to the dermatology department of regular hospitals in time, combined with relevant examinations, clear diagnosis and timely treatment.