I would do a thorough bug check during the day and at night with a very strong light. If you see no signs of bugs then they are likely fine.
Don't let Rutabaga out in any wet, cold weather for about a week. Dawn dish soap is amazing stuff. It strips the grease off everything it comes in...
The red butt and sneezing are unrelated.
Chicken skin that is bare and exposed to the elements turns bright red. It is not raw, just red. It is not an issue unless the other birds start molesting him due to the red skin being exposed. If he starts getting picked on by other birds and his...