Had bruised knuckles for about 6n months a few years back... had to shadow box for a long long time (was doing straight boxing at the time).

I tried padding my knuckles many different ways (good thing to try and if it works great) but mine were too bruised. I started hitting harder than my body was ready for I think...

This might be a possibility and a good way to look at it. When you see it as a negative the body will not respond as well to thinking it as a positive or normal and ok... body is talking to you... the more we listen the more we can work with it.

Traumeal - topical and internal
Massage
EFT!!!!!!!!!!!!!

General rule with pain.
If the pain doesn't increase with training it is ok to train. If it hurts more when hitting - simply don't hit if at all possible.

Make sure you are getting omega 3s as an imbalance between 3's and 6's promotes inflammation...

ginger is good for pain

basics like water, food and sleep are huge in any healing

If doc says they don't know - go find someone who does - there are always things you can do and there ARE ways to heal and deal with pain. Find someone that knows what they are talking about and that can get results. Results talk!!!

Good luck