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.
If the lunula is damaged, a toenail still grows back, but nail growth is permanently changed. These changes can include the nail having a bumpy texture or the nail becoming much thicker. Nail loss can be due to a trauma or a fungal infection, which can cause the nail to become detached from the nail bed. A detached toenail appears white in the area that has separated from the nail bed.