Are you really serious? Count yourself lucky that you don't have pain, drainage, etc. from your cyst. The discoloration may even be unrelated to the cyst. Regardless, I'm surprised that little bit of discoloration is causing such distress in your life. As a guy, I'm not sure I've ever worried about how my butt looks... My advice would be to have the pilonidal definitively treated (you've only had a lancing so far, right?) by a surgeon (preferably a colorectal specialist) before it causes you bigger, more painful problems.