I would apply warm compresses to the area, and continue with the antibiotics and drops. You can get an immune system booster supplement from a health food store, it's called L-lysine and usually comes in powder or capsule form. If you get the capsules, make sure they are plain L-Lysine, 500mg. Just break them open and give him half a capsule mixed with wet food morning and night. My FHV cat seems to do well on it, his eye is still weepy but never swollen or crusty.
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