My food allergy hives broke out anywhere and would change places. My anywhere - I do mean that. I hated on my feet, and OMG when on private areas, UGH! I had them for 8 miserable years with the allergist not having a clue as to why (he didn't "believe in" the IgG blood testing or enetrolab's IgA testing). I was on multiple allergy & asthma meds, but when the hives got bad, Benadryl helped. Because it was systemic (from the inside) and could move positions, creams didn't do much for me.
As for how they would look - big swaths of angry dark RED with a multitude of little bumps.
The few times one of my daughters (see www.ItsNotMental.com) got hives as a toddler, they were bigger, like big round welts, that would come and go and they were sparse. Later she got different types of hives with areas with small itchy-stingy bumps.