I have a chick that has always had a weird vent. He is also having problems pooping. The poop will get stuck coming out and then the vent starts turning inside-out. I have to help him out about once a day. I just squeeze his bottom, gently, and a lot of poo comes out (about twice as much as is sticking out). Then I clean it and he is fine until the next day. I put Vaseline on it today, GwenFarms suggested that and bearing grease but I haven't tried the grease yet. He eats and drinks, seems happy, but he does squeak when I clean it. Oh yeah, I do see him poop normal at least once everyday. Here is a picture after I cleaned him, before drying and applying Vaseline:
