I had the same thing happen to me when I injected winni into my quad. It was about baseball size, warm, red, and tender to the touch. My doctor said that I messed up my tissue around that area and had a little infection. I stopped injecting and it went away in a little over a week. I would say that if it gets worse or doesn't go away in a week or two, go see a doctor. You can never be too careful.
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