It seems like an Urticaria(hives) to me,but which type it need a question answer session to know the exact cause and medical and drug history really.
But in the mean time you can try Anti histamines
180 mg once daily for a week and 1% Hydrocortisone
ointment on the rash once a day for a week.
one thing thats unusual is numbness and tingling
sensations which needs to be examined soon by your doctor because i can't comment on it due a very brief history.
I hope you ll find this discussion helpful.