They had grown so cold that the nail beds looked blue.
Both conditions reflect an insufficient supply of oxygen to the nail bed.
They tend to be painful due to the pressure applied to the nail bed and plate.
If you bite your hangnails, infections can grow under the nail bed.
This can often include the destruction of the nail bed.
Changes to the nails, such as pitting or separation from the nail bed.
They may crumble or separate from the nail bed.
Are the hands, nail beds and feet pink and warm?
Nails can turn yellowish and peel away from the nail bed.
A similar tumor, although in the nail bed, is called onycholemmal.