Question: what are different nail diseases?
Answer: Nail discoloration. The normal nail is pale pink in color. ... 
Bacterial paronychia. This is a condition caused by bacterial infection of the nail fold. ... 
Chronic paronychia. ... 
Traumatic changes to the nail. ... 
Elevation of the nail plate (onycholysis) ... 
Ingrown nails. ... 
Nail thickening. ... 
Nail ridges.