Inclusion Criteria:  All patients visiting our clinic with a dermatologic condition between 1/1/2010-31/12/2020 For the second study, only patients with histologic/dermatoscopic diagnosis of alopecia areata, presenting to our clinic between 1/10/2020-30/9/2021 are included.  Exclusion Criteria:  For the second study, patients with other alopecias, patients denying data sharing despite signing the informed concent and presenting outside the study period are excluded.