<Li> Seborrheic - like psoriasis (also known as "Sebopsoriasis", and "Seborrhiasis") is a skin condition characterized by psoriasis with an overlapping seborrheic dermatitis . </Li> <Li> Sebaceous adenoma, a benign slow - growing tumour--which may, however, in rare cases be a precursor to a cancer syndrome known as Muir--Torre syndrome . </Li> <Li> Sebaceous carcinoma, an uncommon and aggressive cutaneous tumour . </Li> <Li> Sebaceous cyst is a term used to refer to both an epidermoid cyst and a pilar cyst, though neither of these contain sebum, only keratin and do not originate in the sebaceous gland and so are not true sebaceous cysts . A true sebaceous cyst is relatively rare and is known as a steatocystoma . </Li>

Infection of the sebaceous gland and the formation of pimples