Dermoscopy of Hailey–Hailey disease in dark skin: a multicentric observational controlled study by the International Dermoscopy Society Task Force on "Imaging in Skin of Color".

Hailey-Hailey disease (HHD) is an autosomal dominant genodermatosis related to mutations of the ATP2C1 gene (encoding a calcium pump of Golgi apparatus).[1] It typically manifests during the second or third decade of life and is clinically characterized by erosions/fissures and scaly/macerated plaques or chronic vegetations mainly involving flexural sites.[1] These clinical manifestations are similar to those of other common intertriginous dermatoses, making the differential diagnosis particularly challenging.[1] This is even more relevant in dark-skinned patients, in which important clinical features (e.g., shade of erythema and sharpness of lesions margins) may be less evident.[2] Over the last few years, dermoscopy has been shown to improve the recognition of several inflammatory dermatoses in both light and dark phototypes.[[3]] However, data on HHD are sparse and limited to single case reports.[[5], [7]] In this multicentric retrospective observational study conducted by the "Imaging in Skin of Color" Task Force of the I International Dermoscopy Society i (IDS), we sought to characterize dermoscopic findings of HHD, as compared to those of the main clinical mimickers. Dermoscopy in general dermatology (non-neoplastic dermatoses) of skin of colour: a comparative retrospective study by the International Dermoscopy Society. Moreover, a possible overlap with flexural lesions of Darier's disease due to histological similarities should be considered, thereby clinical/anamnestic data remain of utmost importance in distinguishing these dermatoses. [Extracted from the article]