Aside from of course getting a diagnosis....Just train whatever doesn't hurt it. If tucking your elbows is an issue, when you get a clean bill of health, learn to tuck them, even if it means using just the bar and working up.....if you still can't tuck them properly, switch to close-grip (~16") until you can tuck.
Make sure to ask a sports doc or an orthopedist with experience with ATHLETES.....ask the wrong Doc and you'll either get "stop lifting" or "use the Smith" or some other equally gay answer.....or they'll give you a bunch of 1000mg Ibuprofen horse tabs and send you on your merry way without addressing anything, then you can come back in 6 months to address a stomach ulser along with your now totally unfunctional shoulder, lol/jk.
It is most likely nothing and related to flaring the elbows.....but better be armed with a diagnosis than be screwed in the long-term.