<unk>  is a rare disorder in the general population, with a variable incidence of 0.56 to 1.5% in western developed countries. The age of onset ranges from 15 to 75, with a peak in the 4th to 5th decades of life. There also seems to be a greater prevalence in females, but this might be due to higher consciousness to cosmetic defects.
Xanthelasma
Onychophosis
Melasma
Hypertrichosis cubiti
Woolly hair nevus
Koilonychia
Onychogryphosis
Halo nevus