I'm 19 years old male and I recently had a operation if displaced fibula. After 1 week there was small red dots in my other leg which later turned into a big spots. Allergy is there only in non operated leg. I consulted a skin doctor too. He said it's a viral infection after post operation due to low immune system. He gave me some medicine and i'm taking levo cetrizine and allegra 180 recently. How long will it take to clear up the allergy?