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Analysis of skin surface substances using scanning electron microscope energy-dispersive X-ray spectroscopy: a suspected case of pseudochromhidrosis

275 The present report is one of few describing both the histopathological and dermoscopic findings of PP. Bolewska [7] and Mehta [8] have reported the dermoscopic features of PP patients at different stages, but did not observe many findings in common. Our observation suggests that the fully developed and late stages of PP are probably relevant to the dermoscopic pattern of a brown circle-shaped centre, surrounded by linear vessels with branches and perifollicular pigmentation; moreover, the early-stage dermoscopic pattern may be correlated with the superficial dotted vessels. Darier’s disease, Dowling-Degos disease and confluent and reticulated papillomatosis may show similar clinical features with PP. On dermoscopy, Darier’s disease shows a central star-shaped, branched polygonal or roundish-oval brownish area surrounded by a whitish halo. Dowling-Degos disease shows a brown star-like area or irregular brownish projections with a hypopigmented centre. Confluent and reticulated papillomatosis shows fine whitish scaling and brownish areas in a “cobblestone” or “sulci and gyri” pattern [9].In conclusion, we describe the dermoscopic features of PP in a patient presenting with characteristic linear vessels with clustered branches and scattered perifollicular pigmentation. While dermoscopy has a role in PP diagnosis, histological examination of PP remains necessary for diagnosis.