Are There Any Side Effects Of Taking Fexofenadine?

Hi Doctor I had allergy to egg since long time. Then doctor gave me Avil tabs and it went. Then sometimes I used eggs and later stopped. I have eczema also which is giving black itchy marks on legs. I used to drink a lot and smoked too. Not I stopped smoking and drinking , still I get itchy skin with black and red patches all over the body, especially on legs and hands and thighs. I am taking fexofenadine 180 mg since 6 months still no relief. My immunoglobulin IE level is 510 . Please advise as even after i stopped eggs , poultry roducts, smoking and drinking, and taking fexofenadine 180, still i get itchy a lot.