<unk>  (from the Greek words ὄνυχο- ónycho-, "nail" and ῥῆξις rhexis, "bursting"), is a brittleness with breakage of finger or toenails that may result from hypothyroidism, anemia, anorexia nervosa or bulimia, or after oral retinoid therapy.<unk>  affects up to 20% of the population.
Onychorrhexis
Onychomadesis
Karyorrhexis
Rhagades
Synechia 
Hypertrichosis
Aphalangia
Leukoedema