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Author: Dr Daniel Mazzoni, Junior Medical Officer, Royal Brisbane and Women’s Hospital, Brisbane, QLD, Australia. DermNet NZ Editor in Chief: Adjunct A/Prof Amanda Oakley, Dermatologist, Hamilton, New Zealand. Copy edited by Gus Mitchell. January 2020.
Idiopathic eruptive macular hyperpigmentation is a rare benign pigmentary disorder characterised by asymptomatic hyperpigmented macules with a predilection for the upper body regions . It is classified as a variant of acquired dermal macular hyperpigmentation.
Idiopathic eruptive macular hyperpigmentation can occur in any age group and affects both sexes. Most reported cases involve children and adolescents .
The cause of idiopathic eruptive macular hyperpigmentation is unknown. The hypermelanosis occurs sporadically in the absence of preceding illness, inflammation, sun exposure, or medication . It has not been reported to be familial .
Hormones have been hypothesised to play a role in cases that have worsened during pregnancy.
Idiopathic eruptive macular hyperpigmentation is characterised by multiple discrete asymptomatic brownish-black small macules or larger patches.
Idiopathic eruptive macular hyperpigmentation is not influenced by exposure to ultraviolet (UV) radiation .
The diagnosis of idiopathic eruptive macular hyperpigmentation is established by histopathological evaluation of a skin biopsy.
Idiopathic eruptive macular hyperpigmentation can be clinically misdiagnosed as one of the following conditions.
Treatment of idiopathic eruptive macular hyperpigmentation is not required because lesions are asymptomatic and resolve spontaneously within several months to years. Once cleared, there are no residual changes or scarring . Recurrence has not been reported.
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