Observation:
Syringocystadenoma papilliferum and apocrine hidrocystoma are benign cutaneous tumours which usually occur separately. Sebaceous induction is usually defined in dermatofibromas and melanocytic nevi. However, its association with SCAP and apocrine hidrocystoma has not been reported before. Herein, we describe a 19-year-old female patient presented with a painless reddish nodule over a yellowish alopecic plaque on her scalp. Histopathological examination showed papillomatosis with a marked inflammatory infiltrate with numerous plasma cells in the stroma and many multifocal and multi-locular cystic apocrine hidrocystomas. Below the epidermis, immature sebaceous glands, positive for epidermal growth factor receptor and without an association of a normal hair follicle, were detected. We may suggest that sebaceous induction may accompany syringocystadenoma papilliferum and apocrine hidrocystoma in a single cutaneous lesion.
Keywords: Sebaceous glands, benign skin tumors