Linear syringocystadenoma papilliferum of the arm: a rare localization of an uncommon tumour.

Sir, Syringocystadenoma papilliferum (SCAP) is a rare benign adnexal skin tumour of apocrine or apoeccrine type with characteristic histopathological features, and varied and non-distinct clinical findings (1). The vast majority of lesions are solitary and occur in the head and neck region. Their occurrence at other anatomical sites is uncommon, and linear arrangements of these lesions are particularly rare (2). We report here an unusual case of multiple SCAP in a linear distribution presenting on the arm.