I've never seen it, but at this point I'd just trust your doctors.
I'm NOT a doctor and have no medical training, so take this with a grain of salt, but if I had that problem I think I'd try to dry it out by skipping all lotion and putting alcohol on it a couple of times a day. You should not use alcohol on a fresh tattoo, but a month out, I don't think ti would hurt. Just my 2 cents. Maybe try that for a week and see if it helps. If that didn't work, I'd try rubbing vitamin E on it. I don't think that either of those things would hurt, but again I'm not a doctor; just telling you what I would try.
Good luck