Hello Sir! I am 30 years old female. 15 days back I had sudden itching and rashes on my face and back. Later there was swelling also. It took almost 10 days to recover. Last night suddenly I had severe itching on my neck and hair. Later there was swelling on face, neck and allergy grew on hands also. I have not tried anything new on face, hair, food, cosmetic. I am not able to understand of what I am allergic to. Please help.