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Author: Dr Duncan Lyons, Resident Medical Officer, Gold Coast University Hospital, Gold Coast, Queensland, Australia. Medical Editor: Dr Helen Gordon, Auckland, New Zealand. DermNet Editor in Chief: Adjunct A/Prof Amanda Oakley, Dermatologist, Hamilton, New Zealand. Copy edited by Gus Mitchell. July 2020.
Pseudochromhidrosis describes the excretion of normal colourless sweat, which then becomes coloured on the skin due to an exogenous agent.
Pseudochromhidrosis is rare. It has been seen in adults and in children .
In pseudochromhidrosis, the sweat is coloured by chromogenic bacteria, a coloured chemical, or a dye on the skin surface.
Other organisms and colours have also been reported.
Pseudochromhidrosis can affect any body area. The colour of the sweat depends on the underlying chromogen or dye. The stain may be seen on the skin or clothing [1–5].
The differential diagnosis for pigmentation of sweat and skin may include [1–4]:
Pseudochromatosis is diagnosed by taking a thorough history and checking for any possible contact on the skin with chemicals, dyes, and coloured clothing. Check for possible risk factors for skin infection.
The diagnosis may be supported by:
The treatment of pseudochromhidrosis may include a combination of topical and oral erythromycin for 1 to 2 weeks if chromogenic bacteria are suspected, even when culture-negative [4,5].
Any likely causative chemical or dye should be removed.
Pseudochromhidrosis often clears up once the cause has been identified and removed or treated.
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