Impossible to say
But may be do to one of the "congeners" found in wines, particularly red wines, including sulfites and similar chemicals which can cause a variety of reactions, including allergic ones with hives
and other rashes.
If you are drinking socially (2 or fewer drinks/day) and it occurs with red wine, try using white wine instead. If you are a heavier drinker, you need to cut down to safer levels.