Hello and welcome to HCM.
Thank you for your query.
If there was such a sudden outbreak, this could most probably be a hypersensitivity
reaction requiring the administration of anti-histamine
medication. Depending on your situation we can administer either an injection or give you a tablet for the same. Please visit the ER at the earliest for treatment.
I hope I have succeeded in providing the information you were looking for. Please feel free to write back to me for any further clarifications. I would gladly help you.