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I'd phone 111 and see what they suggest. My DD was bitten/stung a week ago, and it continued to swell and be puffy and red despite taking anti-histamines, putting anti-histamine cream on and taking anti-inflammatories for a couple of days. Se we phoned 111, who sent us to an out of hours appt at the local hospital (it was bank holiday weekend) and a week of antibiotics have done the trick.