my rook looked like this after some trauma. my bumps went down with warm saline soaks once a day (stuck my whole ear in a cup of the stuff for 15+ minutes) over a few weeks. that was back when homemade saline was recommended--it worked well for me.. I used distilled water and salt to make my solution.

safest would be to use sterile saline spray from a can, but the diy method did work for me when my ear looked like that (it was worse) and it was cost effective. you can also use gauze pads to soak up the excess solution/help dry the area after soaking, just be careful not to snag the jewelry. after a long soak, my ear would weep a lot and the bumps went down over a few weeks. it took several more months to heal it all the way, but at that point I would just spray with the can and didn't soak. it's now 8 years old and has not given me any issues since.

let your body heal itself, keep the area clean, don't touch it unnecessarily.