Hi, the swelling is most likely to be due to the infected cyst. If wisdom teeth are causing your symptoms, you should have other problems like painful swallowing or chewing. Cystic acne lesions sometime require both drainage and injection with cortisone. Within one or two days of injection into a cyst, the steroid will shrink the inflammation producing relief of pain and almost immediate cosmetic results. If your symptoms are not improving, you will need to consult your doctor, as there could be persisting infection, for which you may need oral antibiotics also. Regards.