Ever since mid December I've had severe acne. My forehead and cheeks have been inflamed since then. I went to a dermatologist in late January and he had prescribed me a oral pill, clindamycin 1%, and 10% benzoyl peroxide. He also insisted that get liquid nitrogen treatments every week until the acne goes away. All that has helped, my acne is maybe 60% better but there are a few cysts that are not going away on both of my jawlines. They irritating me! They itch, and they are really red and inflamed. Will cortisone shots help?