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Syringocystadenoma papilliferum and hidradenoma papilliferum are both apocrine papillated cystadenomas. Clinically, syringocystadenoma papilliferum appears at birth or in early childhood as a crusted, often weeping, verrucous plaque, usually on the scalp. Occasionally, it occurs on the face and less often still on the trunk or the extremities. In contrast, hidradenoma papilliferum almost always develops in […]