Dyshidrotic dermatitis (dyshidrotic eczema, pompholyx) is generally defined as a recurrent vesicular eruption limited to the hands (most often the sides of the digits) and sometimes the feet. The etiology is unknown; no causal relationship with sweating has been shown. There is no sex predilection. The lesions are extremely pruritic.

Dyshidrotic eczema can be associated with atopic dermatitis, contact irritants and allergens, dermatophyte and bacterial infections, hyperhidrosis, hot weather, high dietary intake of nickel or cobalt, and emotional stress. Administration of intravenous immunoglobulin (IVIG) has been associated with severe dyshidrotic dermatitis. There have also been a few reports of dyshidrotic dermatitis in patients treated with secukinumab. 

Some cases spontaneously resolve. Treatment is aimed at symptomatic relief and control of vesiculation.