The first study will aim to identify the incidence and prevalence of alopecia areata in the dermatology clinic of a metropolitan teaching hospital between 1/1/2011 and 31/12/2020~The second study will assess (1) the epidemiology of autoimmune and atopic diseases in patients with alopecia areata, (2) the presence of possible risk factors responsible for the onset/relapse/exacerbation of alopecia areata, (3) the levels of vitamin D and various autoantibodies,particularly thyroid autoantibodies and (4) the variety, duration, efficacy and safety profile of treatment modalities used in our hospital for the management of alopecia areata from 15/10/2021 to 14/10/2022.~The third study will monitor the monthly oscillations of vitamin D and thyroid-autoantibodies of patients with new-onset/relasping or exacerbating alopecia areata for six months, between 15/10/2021-14/10/2022 in order to observe if changes in levels of vitamin D and thyroid-antiantibodies are associated with severity and prognosis (worsening or improvement) of alopecia areata
The study series consists of three studies with the aim to assess the incidence, prevalence, risk factors, comorbidities and management of patients with alopecia areata in Czech Republic based on the patients and registry of a dermatology clinic of a metropolitan hospital.