<prompt> Sebaceous cyst does not occur in the ...ScalpScrotumBackSole  <response>: Epidermoid cyst results from proliferation of epidermal cells within a circumscribed space of dermis which had got implanted within the dermis Sebaceous cyst is a misnomer as the cysts are not of sebaceous origin and the white creamy material filled within is not sebum, but is keratin desquamated epithelial cells Type of retention cyst secretions are pent up in a gland owing to blockage of the ductPathology Cyst wall consist of a layer of epidermis oriented with the basal layer superficial and more matured layers are deep. Desquamated cells keratin collect in the centre and form creamy substance of the cyst.Clinical Features Usually asymptomatic, unless get infected or inflamed and become painful Firm, round, flesh colored to yellow or white subcutaneous nodules of variable size. Central punctum may teether the cyst to the overlying epidermis, from which the white creamy material can be expressed. Rarely malignancies BCC, SCC can develop in epidermoid cyst. No punctum in scrotal and scalp sebaceous cyst.Treatment Excision with the wall is treatment of choice. Infected cyst: Incision and drainage After resolution of the abscess, cyst wall must be excised to prevent recurrence 