I am a new chicken mama and am not sure what this is and how to treat. Padme is my silkie and one of 5 in my coop (2 cochins, 2 RIR, 1 Silkie). I checked all other birds and maybe one other one has something similar but not like my Padme. Now we have red dirt and the birds are wet from the morning dew so it has looked like she was dirty and maybe her food was sticking to her. However when I got to her to clean her up, I noticed it was behind her little ear and then started researching. I appreciate help in identifying and treatment.