DermatologyQuestions

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Once in a while I get small, red bumps all over my arm seemingly overnight. No itchiness, no other symptoms. Usually goes away after a day or so. Sometimes it happens on my face. More info in comments. Any ideas?

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Once in a while I get small, red bumps all over my arm seemingly overnight. No itchiness, no other symptoms. Usually goes away after a day or so. Sometimes it happens on my face. More info in comments. Any ideas?	1