Odd skin effect from mepron

I've been under the care of a LLMD for just over 3 months now. Symptoms are consistent with Lyme, Bart and Babs and we've been changing up my meds every month trying to get a substantial reaction. I started mepron just over a month ago and have had most of the miserable expected side effects, but have experienced a few really remarkable periods where I feel substantially improved. 

After the third day on mepron I noticed a very odd new symptom. I had something like 40-80 very small (1-2mm) black rings pop up around both hips. The outline of the rings are dark black in color, but very thin and the center is unmarred skin. If you were to take a very fine point pen and draw tiny circles on your skin you would have something that looks almost identical. I tried to scrub them off when I first noticed them, but they are under many layers of skin and don't come off. Now, after a month, some of them are actually starting to fall off.

I was able to show them to my LLMD yesterday, but he had no idea what they were. I can't seem to find anything resembling this in the side effects of mepron (there is a rash common, but it looks nothing like this). I can't find anything like this described by anyone who was treated for babs. I find it hard to believe it's a coincidence (ie a brand new symptom shows up immediately after starting a new medication, but somehow its not related). Does this sound remotely familiar to anyone?

I've been nauseous from the first dose. Sometimes it's just a mild background thing, but other times I'm on the verge of vomiting for hours at a time. It's particularly problematic, because I'm supposed to be eating high fat foods before taking my doses, which is really difficult with the nausea. There's some abdominal pain as well, but I have relatively little trouble with that compared to the nausea.

There has also been some odd mood problems. I saw quite a bit of anecdotal reports of people getting depressed after starting mepron, though I didn't see it on the official side effect list. I definitely noticed some uncharacteristic depressive symptoms soon after starting it and quite a bit of mood fluctuations. I'm sure being nauseous all the time doesn't exactly help my mood, but this was above any beyond.

The full list of side effects matches up with much of my typical symptoms pretty well, so it's hard to decide what is causing what beyond these few. I started getting some wicked gland pain, but that is a common part of any herx I might have, so I attributed it more to that. These little rings is the only change that really just baffled me... it feels like something that could be useful diagnostically if they could just figure out what it is.