Phakomatosis pigmentokeratotica is a rare neurocutanous condition  characterized by the combination of an organoid sebaceous nevus and speckled lentiginous nevus. : 634–5 : 776  It is an unusual variant of  epidermal naevus syndrome. It was first described by Happle et al. It is often associated with neurological or skeletal anomalies such as hemiatrophy, dysaesthesia and hyperhidrosis in a segmental pattern, mild mental retardation, seizures, deafness, ptosis and strabismus. See also
Skin lesion
List of cutaneous conditions associated with increased risk of nonmelanoma skin cancer

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This is due to the effect of gravity, hence the name inverse hypopyon. Treatment
A hypopyon should not be drained, because it offers protection against the invading pathogen due to the presence of white blood cells, although long-standing hypopyon can cause close-angle glaucoma and anterior synechiae.Intravitreal antibiotics can be used if endophthalmitis is suspected. See also
Hyphema
Uveitis

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