I had this happen to a young pullet once, but much worse. She healed perfectly. All I did was flush with sterile saline (1 qt boiled water & 1/4 t salt, cooled) and cover with neosporin. She quickly developed a very thick scab that I just left alone and it just kept getting smaller and smaller until it eventually fell off and she was perfectly healed. She did have a small bald spot on the back of her neck, but most of her feathers grew back.
I don't used antibiotics or pain relievers for the chickens.
I don't used antibiotics or pain relievers for the chickens.