We have Red Jungle Fowl. One hen is sitting (eggs began hatching last night) and her face is VERY swollen. We are very attentive and know our flock well (lap-pet chickens) but didn't notice anything until suddenly this last saturday. Her whole face is swollen and covered with soft bumps and her comb is swollen very thick. She is in the same chicken house as the rest of the flock but is the only one with this symptom. She's acting normal (for her) but her face looks horrible and is itching (she had created some small sores from scratching it). Our first thought was 'mosquitos' so we remove the water from the chicken house before the mosquitos begin coming out for the night, and place it outside. We shoo any mosquitos out of the crate she's nesting in and have tried spraying an herbal oil based repellant. The swelling hasn't gone down as I would expect it to after keeping new mosqitos out for several days. Could she be having a bad allergic reaction to mosquitos? Any ideas on another potential cause or remedy?