It's possible he has a food allergy?
My nine month old seems to always have a runny nose and a cough that comes if he cries and usually after he wakes up. He has circular red rash spots one on the side of his face and several on his torso. He has dry skin, especially on his arms and legs. He also gets red puffy eyes. He gets gunk in them whenever he gets a new cold. The eyes seem to get red whenever he is around the cat though. He's had these symptoms a long time, but it never seems to affect him that much, so I haven't made a big deal about it. I'm wondering though if maybe he has a mild allergy, maybe to dairy?