what can be the cause of swelling, say on the face? There's no puncture marks/cuts/abrasion and you find a part of your face swollen and in a red, round patch about 4cm in size? Is it safe to just take a course of antibiotics and will this help the swelling to subside within say, 2-3 days?
Joe
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Look, I'm no doctor but since there are no cuts it sounds a bit like an allergy. I mean, infections only appear if you cut yourself or at least, some sort of punctured mark.
A round patch of 4 cm in size? A blood blister - this can't be since you need to have some contact with an object...
Why don't you call your local doctor?