PPD skin test prior to med school/elevated bilrubin

I doubt your elevated bilirubin means anything. If you had hepatitis, your liver enzymes (AST, ALT) would be high. A not insignificant percentage of the population (something like 5% of whites, I believe) has an innocuous condition called Gilbert's Syndrome that can lead to slightly elevated bilirubin levels.

I also doubt your slightly elevated bilirubin numbers mean anything, but another number to check would be your alkaline phosphatase number. Were you exposed to the cadaver's blood while you were working on your cadaver studies? If you are worried that you may have any of the Hep viruses, getting tested might be good. If you contracted a virus as an employee, you may be entitled to some benefits, but of course you will need to prove that you got it as an employee. Based on what you are saying about your PPD, it sounds like you just got a bruise from your initial shot, but I would have to see it to be sure. Answers for both of these issues should come from your physician or whoever drew your blood/ gave you your PPD shot.

I had the same reaction to my PPD test - no bump but a red colored skin irritation at the injection site (>72 hours post-injection)about 10 mm in diameter. I did some research and it turns out that since I was given a polio vaccine at the same time, that probably caused the reaction. Unless you've been exposed and/or are in a high-risk category, I doubt if your skin test is a positive reaction.

A positive PPD is based on INDURATION, not erythema. In other words, redness doesn't count...it must be raised.

I'd recommend that if you are concerned, go see your physician, rather than seeking advice from a semi-anonymous internet forum.