I smelled a marijuana plant and it touched me under my nose now i have hives under my nose and on my chin what can i do ?

Benadryl (diphenhydramine): While an uncommon cause of hives, it is possible you are allergic to marijuana. I see you already are on benadryl (diphenhydramine). This remains one of the best medicines for hives. Take more Benadryl (diphenhydramine) now. Vitamin c (1000 mg an hour) & b5 (500 mg 4x/day) & homeopathic remedies like urtica urens may help as well, but Benadryl (diphenhydramine) should do the trick! avoid exposure to cannabis in the future!