My Barred Rock has a swollen vent. This started about 10 days ago, with a slightly swollen area, but nothing too bad. I detected fleas on my flock, so have been treating them with DE. A few days, ago, the BR developed what looks like hard pustules around her vent. There were flea eggs there before, but I got rid of them by trimming the feathers and plucking other feathers, and maybe she picked at it too. There was fewer fleas on her and no more eggs. However, her vent is very swollen (see pictures). I don't know if it's related to the fleas or a separate issue. The swollen parts are quite hard. It does not look like her vent is inside out. She appears to be pooping normally and eating too. She is very quiet though, compared to her two sisters and compared to normal. She rests a lot, stands in place, does not peck and jump around like she usually does. She just seems very subdued. I kept her in the coop yesterday, but she seems to prefer to hang out with her sisters, so I have our outside today. I cleaned their coop and run really well last week and the fleas have subsided. Today I washed her vent with soap and warm water, applied some hydrogen peroxide to the area and put Neosporin on it. I don't know what else to do, I guess I could call a vet, but I don't know if it's an internal infection, maggots (just a long shot idea from reading others' posts), swollen from the fleas and her picking at it. I don't believe the other hens are picking at her at all, they seem to be leaving her alone. She is laying about an egg a day. I've read a lot of posts on the forum, and it might be vent gleet, but I can't figure out what the right treatment is. Any help is appreciated, thank you.