<unk>  is a loosening of the exposed portion of the nail from the nail bed, usually beginning at the free edge and continuing to the lunula.  It is frequently associated with an internal disorder, trauma, infection, nail fungi, allergy to nail enhancement products, or side effects of drugs.
Onycholysis
Onychia
Paronychia
Leukonychia
Melanonychia
Platonychia
Scalp rash
Onychophosis