I'm not sure what cyst you're referring to, as for the scar. Unfortunately, due to the nature of scar tissue, they are difficult to remedy. Plus your's is quite large and depressed. I would suggest to find a good quality, organic oil serum (nothing overly expensive, but also nothing in a clear plastic bottle). Look for something containingrosehip, chia seed, jojoba or argan, etc. Rub in a single drop each night after cleansing.

It will take time!Scars are inherently resilient to treatment, unless you go for laser treatments, etc, but nothing with be a miracle/overnight fix