So, I have been trying to help our Petunia (SLW) pull it together for a while now and I am wondering why she fails to do as well as the others and what to do about it. She is a petite (thin) wyandotte and always was a slow developer. She is one year old. She is roosters favorite as well so has lost some saddle feathers. Eggs are thin shelled, bleached and porous. She is the only one who continues to have mites and lice after treatment. It has been a horrible year for bugs here so I treat them all once per week with poultry dust (permethrin) and DE. Nobody else has symptoms like Petunia. I gave her a bath Saturday and she has a bulbous area just below her vent that is inflamed. She has runny poo and a poopy butt. Nobody else has this problem. The inflamed area is where I washed the poopy area. I give her extra scrambled eggs and yoghurt when I can. She behaves normally. I have not fed extra vitamins, maybe I should? I have not wormed, nobody else seems wormy. Can just one chicken have worms? I feed Magill ranch organic feed, BOSS, and scratch and they free range daily. Thank you!