Yoo Sang Baek

Sarcoidosis is a multisystem inflammatory disease of unknown aetiology. Skin involvement has been reported in 12%-27% of patients with systemic disease, and scar sarcoidosis is a form of sarcoidosis developing in previous cutaneous scar are…

Primary cutaneous endometriosis of umbilicus, which is also called Villar’s nodule is a rare manifestation of endometriosis, representing 0.5% to 1% of all patients with ectopic endometriosis. Ectopic endometriosis could be found in nearly …