Had Perianal Abscess. Removed Surgically. Having Burning And Itchiness. How Long Healing Process?

Hi,I had a perianal abscess removed surgically January 3rd and went for a follow up in the sixth I currently do not have insurance. I was on the left cheek directly to the left of the anus. It has been exactly four months and I am still experiencing buring or occasional itching due to urine or sweat and occasional blood spotting and also the release of a clear thin puss which yesterday looked a little thicker and more yellow. How long is the healing process? And how do you know if you have formed a fistula? The cut is obviously still open but in the Mirror it just looks like a pink/purple slightly moist pea size wound closing and healing with close to the surface. I'm assuming the original incision wasn't deeper than an inch if that? Please advise thank you.