What you seem to describe is urticaria - where you develop bee hive type red swelling which is temporary. Some tests are advised to rule our internal infection which tends to also trigger urticaria. A proper examination and thorough history evaluation is needed to try to pin point the cause of urticaria. The allergy takes time to clear out of your body and the anti allergy tablets to be taken for a few months sometimes. You can visit me for a consultation , Hope this was helpful.