Clean the pus out with QTips and remove it all. Flush the eye with saline eye wash, and apply either Terramycin eye ointment from a feed store, plain Neosporin ointment, or Vetericyn eye gel twice a day. Pus and bubbles in an eye might be a sign of MG or mycoplasma, a chronic respiratory disease. Tylosin, Denagard, and a few other antibiotics may help treat symptoms. If it is MG, the chicken may be a carrier.