It is probably a respiratory disease causing sinus infection, common with mycoplasma (MG) or infectious coryza. Do you notice a bad odor around the head? Coryza can smell rotten whicle MG is more common. Tylan 50 injectable give orally is good for treatment of MG, while sulfa drugs, such as Sulmet or Sulfadimehthoxine are better for coryza. Testing can be done to help determine what is going on.