It is very rare and estimated to affect 1 in 100,000 per year. Because of its rarity the documentation, cases and information are sparse and not a huge amount is known for certain, meaning that<unk>  could actually be a set of many un-classified skin lesions. It is known to occur at all ages and all genders equally. Some articles state that women are more likely to be affected than men.
Erythema annulare centrifugum
Tuberculosis cutis orificialis
Tuberculosis verrucosa cutis
Papillomatosis cutis carcinoides
Ichthyosis bullosa of Siemens
Generalized granuloma annulare
Granuloma annulare
Folliculitis nares perforans