EDA and hypohidrotic ectodermal dysplasia: Mutations in the ectodysplasin A (EDA) gene are associated with X‐linked hypohidrotic ectodermal dysplasia (HED), a genetic disorder characterised by abnormalities in the formation of skin, hair, nails, teeth and sweat glands (Deshmukh and Prashanth 2012; Katthika and Auerkari 2018).