<unk>  is a medical condition characterised by severe, uncontrollable, and frequently unprovoked, facial blushing. Blushing can occur at any time and is frequently triggered by even mundane events, such as, talking to friends, paying for goods in a shop, asking for directions or even simply making eye contact with another person. For many years, the cause of the condition was thought to be an anxiety problem, caused by a mental health disorder. However, in recent years experts in the field of the disorder believe it to be caused by an overactive sympathetic nervous system, an automatic response which sufferers have no mental control over. It is related to focal hyperhidrosis, more commonly known as excessive sweating, as it is caused by the same overactive nerves which cause excessive sweating. Sufferers of severe facial blushing commonly experience focal hyperhidrosis. Studies have also shown that patients with severe facial blushing or focal hyperhidrosis commonly have family members with one or both of the related disorders.
Idiopathic craniofacial erythema
Capillaritis
Granulomatous facial dermatitis
Ichthyosis bullosa of Siemens
Phytophotodermatitis
Tar melanosis
Idiopathic facial aseptic granuloma
Diabetic dermopathy