Can a bulla mass that was left untreated nor removed by veteran doctors for years be grounds for medical neglect?

Probably not.

Medical question not legal. Can you prove cause of death? Can you prove negligence? Ask your doctors what they think 2 year statute of limitation in NC.

It takes the opinion of a medical expert to answer that question. Medical malpractice lawyers have such experts available to render opinions.

You would need a doctor to give you an opinion as to whether not treating the mass constitutes medical negligence. Normally, you would need to get a malpractice attorney to help you obtain an opinion from an appropriate doctor. In S.C., you must bring the action within three years of when you had reason to know malpractice might have occurred, or 6 years from the date of the malpractice incident, whichever is earliest. This means it must be brought within 6 years regardless of when you discovered the malpractice.

In order to prove a medical malpractice case, a claimant must prove a failure to conform to accepted practice. If it is a "judgment call" by the doctor, there is no malpractice, even if the doctors made the wrong call. Also, there will be questions as to whether the statute of limitations has expired. Other questions are whether the bulla mass caused your father's death and whether any action on the part of the VA doctors would have made any difference. You will need to get copies of ALL of your father's medical records and have a doctor review them. These case are difficult, time-consuming and expensive. They will fight this all the way.