Why did wasp sting inflame?

I’ve been stung before and the sting only inflames very little for a few minutes then it looks like a little ant bite. Yesterday I got stung twice, one on my finger and the other on my shoulder. Now, the one on my finger is inflamed but the one on my shoulder just looks like a small ant bite. Why did only one sting... show more I’ve been stung before and the sting only inflames very little for a few minutes then it looks like a little ant bite. Yesterday I got stung twice, one on my finger and the other on my shoulder. Now, the one on my finger is inflamed but the one on my shoulder just looks like a small ant bite. Why did only one sting get inflamed?
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