had an ingrown toenail removal a few weeks ago, where half of my nail was removed. There seems to be a small white tender blister on nailbed.

Was the nail . Removal use in conjunction with phenol? For a permanent nail avulsion? If so, that would cause or show a white blister or area from the use of the chemical.
Blister. do not pick at it or try to pop it. It could become infected if you do. If there is redness or pain see your doctor for antibiotics. Otherwise just keep the area clean.