Help! Huge welt on hand.

Patient : Can someone tell me whether this is just a bug bite or an allergic reaction on my moms hand?
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Help! Huge welt on hand.-1
Doctor :   This seems to be a reaction to an insect bite. The nature of the insect, however, cannot be ascertained . It would subsi de faster with an anti-histaminic medication (taken as a single dose). You may consult your physician, in case your mother develops more such reactions over her body in the next few hours to days.

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