<s>[INST] I was bitten by a friends dog about 10 days ago on the under side of my upper arm. There is a large contusion approx 6 to 7 inches long and about 4 inches wide. It did break the skin and there is a golf ball size lump under the skin. It is still very painful and I cannot stand anything touching it. [/INST] Hi,It seems that you might be having big hematoma following dog bite.Now there might be having infection developed.Go for one antibiotic and anti inflammatory medicine course for 3-5 days.give rest to the part.Go for ARV vaccination.Ok and take care. </s>