Syringocystadenoma papilliferum (SCAP) is a rare benign adnexal skin tumor of apocrine or eccrine sweat gland. SCAP presents as an asymptomatic, solitary, firm, pink papule or nodule. SCAP usually appears on the head and neck, where it may occur within a nevus sebaceous. The unusual anatomical sites of involvement including arms, breast, eyelids, axilla, scrotum, and inguinal and perineal regions and linear arrangements of these lesions are particularly rare. We report a case of linear SCAP in a 69-year-old man. He presented with asymptomatic, multiple, linear arranged, discrete or confluent, dome shaped erythematous nodules on the extensor site of right forearm since childhood. Histopathological findings showed the invagination from the overlaying epidermis and central papillary projections covered by double-layered glandular epithelium, and numerous lymphoplasmacytic cells infiltrated in the fibrous core of papillary process. He was diagnosed with linear SCAP and had no recurrence 3 months after complete excision.