Go to a hospital, they might be hives from an allergy you don't know you have.
Example&Anecdote time: I made tea cakes for my mother using old cake flour, thinking it'd be fine, since it was closed up. I never brought them to her, because an hour after eating one I broke out into small red patches that got bigger and bigger until I was scratching and crying and had no idea what was going on and my dad picked me up and rather carried me to the hospital.
Turns out, allergy to mold in the old flour. One in a million chance of ever being exposed, and yet. So, yeah, y'oughta get that checked out, and soon. ♥;;;
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Example&Anecdote time: I made tea cakes for my mother using old cake flour, thinking it'd be fine, since it was closed up. I never brought them to her, because an hour after eating one I broke out into small red patches that got bigger and bigger until I was scratching and crying and had no idea what was going on and my dad picked me up and rather carried me to the hospital.
Turns out, allergy to mold in the old flour. One in a million chance of ever being exposed, and yet. So, yeah, y'oughta get that checked out, and soon. ♥;;;