Wyorp Rock has asked very good questions. In the past few years some have had tick bites that have caused bluish swelling of wattle or face. Sometimes the swelling goes down with a single dose of benadryl (1/2 of a 25mg tablet.) It may take a day or two to go down. If you are not seeing ticks, then common causes of swollen wattles and the face are fowl cholera or coryza. With those, you should be seeing other symptoms like nasal drainage, coughing, eye goop, and trouble breathing. Let us know what you think. Permethrin 10% spray is fairly safe for chickens to spray on the birds and in the coop to treat for ticks or other bugs.