Help please - my hen's ear is swollen!

She needs antibiotics for an ear infection. Can you try cleaning her ear out with hydrogen peroxide (warmed) and cleaning with a Q-Tip. Then fill the ear canal with Neosporin ointment. If you can get some amoxicillin, clavamox, penicillin, or similar antibiotic to treat her with she should clear up okay. These infections are apparently painful. Here is a similar infection: https://www.backyardchickens.com/t/831156/really-nasty-ear-infection-in-a-silkie-hen-graphic-pics

 

As Eggcessive said, it looks like an ear infection. Penicillin would be a good antibiotic to use. For a normal five pound chicken, the dosage is 1/4 to 1/2 ccs. You inject it into the breast muscle usually, once daily for 5-7 days.