Pempholyx, also known as dysphagia or dysphagic eczema, is a recurrent, pruritic blistering rash on the palmoplantar and finger flanks. The etiology is unknown and is generally thought to be a reaction to a variety of endogenous and exogenous factors, including atopy, hyperhidrosis, dermatophytosis, allergy to nickel, chromium, balsam, cobalt exposure, irritant dermatitis, emotional stress, and climatic changes. Intravenous application of immunoglobulin in immune reconstitution inflammatory syndrome has also been reported to cause sweat pimples as well as mycophenolate esters causing sweat pimples. Special tests include fungal microscopy, bacterial culture and patch test. Herpes sweat is self-remitting and treatment is mainly to control pruritus and blister formation. Topical glucocorticosteroids are the main treatment, with emollients also having an adjunctive role. Oral antihistamines can be used to stop the itching, and oral or topical antibacterial drugs can be used in case of secondary pustules. Local phototherapy can also be used for treatment.