Hypertrophic Scar from Abscess on Chin?

Hypertrophic scars from acne and pustules can be improved with pulsed dye laser and topical creams. I would recommend Melarase cream for the dark spots and discoloration.

From the description it is hard to know whether the residual lump is from residual, smoldering inflammation, scar tissue formation or the re-formation of a small sebaceous cyst. If either inflammation or scar tissue, the injection of a small amount of an antiinflammatory agent, such as triamcinolone acetonide suspension may be helpful. If a small sebaceous cyst is at the root cause, then minimal incision drainage would be helpful and would pose little threat of visible scarring--critical... more

Unless the entire cyst cavity was removed this cyst will come back. Please seek some professinal help from a plastic surgeon for excision