Hey all...my dog watson has had a blood blister on the side of his finger for a month now...we atteibuted it to allergies and started the cytopoint shots...itching has gone down 80-90% and put him on royal canin hp formula and only give him sweet potato and apples for treats....the blister wont go away thougH....very soft..filled with blood it looks like...heres a pic if anyone knows anything about it...doesnt bother him at all looks worse than it is