Whoa. What causes that again? I had a buck maybe 3 weeks ago like that, about 10 days later (guess) it appeared to be almost totally gone. So, possibly not harmful/fatal?
Probably a seroma/hematoma (blood blister). Caused by running into something, rupturing a vessel and bleeding under the skin. Some just reabsorb and some may organize into a chronic fluid filled cyst.
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