I had a gym work out yesterday and as soon as i went to put my coat on, i felt what i can decribe as a lump on my left shoulder blade, like its under the shoulder blade. i can use my left arm without problems but the whole shoulder blade area is very sore.
Muscle or tendon tear! Yes, that is the brief answer to your question! Thanks for giving me another opportunity on sudden painful lumps in this forum... But don't worry; rest of the specific area along with cold compress/ice could relieve this in 2/3 days; don't rub/massage it to invite infections! It is related to minor trauma, sprains, strains or even tear/edema/silent bleeding while doing strenuous movements and no way this could be serious! Take care; regards,