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  An anal fistula is an abnormal communication or tunnel between your rectum towards your anus, it is commonly caused by an anal abscess. Even though the abcess may have healed, there is now a skin tract or tunnel from your rectum, towards your anus. This tract will stay there until you have surgery done. What is done is usually called a fistulectomy, or fistulotomy. Tracts can course either to the front or towards your back. Tracts towards the front are straight while tracts towards the back are curved. If it really is a fissure, I recommend you see a surgeon and get your answers from them. The tract might get infected and will lead to more pain and suffering on your part, not to mention possible complications.
An anal fissure on the other hand is simply a nick or wound in your anal area,usually superficial but still painful and very prone to infection. Usually it is caused by trauma or passing of hard stools.
The ano-rectal region has a rich blood supply and veins, these veins sometimes get inflamed, enlarge and form what we call hemorrhoids. Men has anal fissures as well, but pregnant women are the majority of the sufferers. There are external hemorrhoids, which are superficial, and internal hemroids which are deeper. Hemroids usually present as painful masses which come out during a trip to the toilet. some hemorrhoids go back in by themselves, some don’t.  Some of them bleed, and some of them do not. In any case, a surgical consult is warranted.
So, what do you have?
If you feel that you have a superficial wound in your anus, it might be a fissure.
If there is a small hole beside your anus that may or may have no secretions, it may be an anal fistula.
If you feel a mass that seems to be attatched to your anus or it seems coming from inside, it may be a hemorrhoid.
Go see a doctor so that you can get treated before it gets worse.