We have a New Hampshire Red chick that was straining to poop yesterday afternoon/evening. It's bottom looked raw and had poop stuck below its vent. We could see some white poop partially pushed out when straining & it went back when the chick relaxed. I cleaned its bottom with a warm, moist cotton ball, gave it some molasses water and then rubbed olive oil on its bottom. All of these were remedies I'd read about on-line. I went to bed hoping for the best and it DID look better in the morning. After work today, it was obvious it had a rough day. Its bottom was poopy again, but the vent was clear and it wasn't straining. But NOW it has an air sac on the right side of its neck. It's as big as its head! It looks like it had an injury in its shoulder area. I spread a little neomycin in an area that looked like it could be dried blood. Should I pop this air sac? I isolated this chick from the other 6 (same age). It has its own heat lamp as well as the essentials of pinechip bedding, water and medicated chick starter. Is there any hope for this troubled chick?