It’s likely you strained your forearm muscle’s/tendons weightlifting. In my experience it won’t go away given the time & that you’ve stopped lifting. If you can see a massage therapist who can work on that area that’s the best option.
If you’re really concerned have your doctor check it out.
(Source: I’m a massage therapist.)
I’d be interested to know, too. I did an internet search but didn’t find anything.