I have had a small hard lump or a knot on the surface of my left biceps for years.
It is small and pretty invisible if you don't know what to look for.
But you can feel it by running your finger over it.
There is a small "pit" just next to it.
I started lifting weighs a month ago and now the same small knot or lump appeared on the surface of my right biceps too.
What are those knots?
Small tears in the fibers of the biceps???
Thread: Knots in my biceps