Mesh : Abnormalities, Multiple / diagnosis epidemiology Adolescent Adult Anetoderma / diagnosis epidemiology Autoimmune Diseases / diagnosis epidemiology Child Child, Preschool Comorbidity Cross-Sectional Studies Darier Disease / diagnosis epidemiology Down Syndrome / diagnosis epidemiology Exanthema / diagnosis epidemiology Eyebrows / abnormalities Female Germany Guideline Adherence Humans Ichthyosis / diagnosis epidemiology Ichthyosis Vulgaris / diagnosis epidemiology Infant Infant, Newborn Lichen Planus / diagnosis epidemiology Male Myeloproliferative Disorders / diagnosis epidemiology Skin Diseases / diagnosis epidemiology Skin Diseases, Infectious / diagnosis epidemiology Young Adult