You describe a swelling which is not painful, ripping skin and the hole getting bigger. Those are certainly alarming signs for me and I would strongly suggest visiting an urologist as soon as possible!!! Just from description I can't really tell what it is, it could be something harmless or but it could be a hyperspadia, syphilitic ulceration, a rare case of tuberculosis outside of the lungs... well, way too many guesses. Let it be examined by an expert. Best case scenario- you get a confirmation, that everything is alright. Worst case scenario- your disease will be cured.
There is a thing that happens with some guys sometimes where their urethra is a normal-sized hole or even a bit big, and it gets stuck together in the middle with something like mucus, and makes two holes for a while, and then the mucus works its way out or comes away and there is just one hold again. Would anything like that explain what happened? Are the two holes together about the size you ever remember your one hold being?
Oh yea p.s the swelling is constant and hasn’t had any big noticeable changes however the hole does change in size if I have a boner or not