I injured serratus in training, picking up a 6,6ft 244lbs opponent while turning my body.
Couldnt even lift my gym bag afterwards.
1 freaking guy came running asking me if I needed help with the soap
in the shower since I was injured
It took 2weeks and then I was back in training fully recovered.
Kyomu, unless it is a real tear that requires surgery there is not much you can do.
Just go easy with the training until the pain is gone.