hi hives and red welts are a side effect of botox so you have had a warning that your allergic to them so after that would you think is wise to carry on? good luck
how safe is botox cosmetic? . a few months ago i had botox cosmetic injected into some facial lines. about 10 days after i experienced hives or red welts on my torso. it went away with benadryl but recurred every night for about a week. each time it went away with benadryl. after that i didn't have any other problems. have i now built up immunity towards the botox or is it possible to have a worse reaction in the future if i have further treatments?