👉 Porphyriasis, also known as porphyria pigmentosa, is a rare genetic disorder characterized by various skin conditions, such as hyperpigmentation and hyperkeratosis. The exact cause of this disorder is not fully understood, but it is believed to be caused by mutations in the genes involved in melanin production and pigmentation. In some cases, the mutation may lead to an overproduction of melanin, which can cause a variety of skin conditions.