differences between left and right hemispheres. 1  for many functions, there are no substantial differences between the left and right hemispheres. 2  lateralization of function is statistical rather than absolute. 3  tendencies:
When the nail plate separates from the nail bed, it causes a white discoloration. This is called onycholysis. This can be due to infection, trauma, or products used on the nails. Other causes for onycholysis include psoriasis and thyroid disease. Pitting. Pitting refers to small depressions, or little pits in the nail.
It can be very painful to tear or rip your nail from the nail bed. 1  Injuries. 2  Separation caused by injury is common in people who have long fingernails. The nail may pry away from the nail bed when it is hit or jammed.  Severe or repetitive toe stubbing may cause a toenail to detach.