<unk> , is a benign, autosomal dominant congenital condition resulting in<unk> cysts on a person's body.<unk>  simplex is the solitary counterpart to<unk> . In<unk> , the tendency to develop cysts is inherited in an autosomal dominant fashion, so one parent can be expected to also have<unk> . It may also occur sporadically. Both males and females may be affected. The onset at puberty is presumably due to hormonal stimulus of the pilosebaceous unit. They most often arise on the chest and may also occur on the abdomen, upper arms, armpits and face. In some cases cysts may develop all over the body. The cysts are mostly<unk> all (2–20 mm) but they may be several centimetres in diameter. They tend to be soft to firm semi-translucent bumps, and contain an oily, yellow liquid. Sometimes a<unk> all central punctum can be identified and they may contain one or more hairs (eruptive vellus hair cysts). They may become inflamed and heal with scarring, like acne nodules (see nodulocystic acne and hidradenitis suppurativa).<unk> s are thought to come from an abnormal lining of the passageway to the oil glands (sebaceous duct). Localised, generalised, facial, acral, and suppurative types of<unk>  have been described.
Steatocystoma multiplex
Steatocystoma simplex
Leontiasis ossea
Lymphangioma circumscriptum
Syringocystadenoma papilliferum
Trichilemmal carcinoma
Generalized trichoepithelioma
Fibrofolliculoma