[header] How to reduce cystic acne swelling [title] Apply a cold compress to the acne several times a day. [step] Wrap an ice pack, ice cubes, or a bag of frozen food in a clean towel and put it over the acne. You can also use a towel that has been chilled with cold water. 
The cold can reduce swelling and pain from inflammation. Leave the cold compress on the acne for 10-15 minutes, or until it becomes uncomfortable.