The diagnosis of<unk>  has been made in several ethnic groups, including Caucasian, Japanese, and sub-Saharan African. Males and females are equally likely to suffer from the<unk> . Since the disorder is very rare, its incidence rate is difficult to estimate, but is less than 1 in 10,000.
Popliteal pterygium syndrome
Tar melanosis
Linguatulosis
Veinoplus
Capillaritis
Haff disease
Idiopathic craniofacial erythema
Palmoplantar keratoderma