It's a small tear between your pec and front delt. This can sometimes be a ligament issue.....but it sounds like a tiny tear. Rest it.....and slowly stretch it back into action. A tiny tear can become a big tear.....doing permanent damage.
Most of the time people think I'm Asian or Asian mixed with white even some Asian people think I'm Asian But I'm Mexican and Peruvian. I don't mind i don't see it as a bad thing
You can look on a Jpanaese website or maybe at a fleemarket.