It would be a gigantic stretch to think that you were abused at around the age of 3, and the abuse did not continue past this age we assume (?) and when you were 12 or so you got something that might have been HPV, might have been related to the abuse when you were three, and then you're having a problem of that sort now, and you're tying this current issue with this all back to something that happened when you were three?
We have to be assuming that of course there's been no sexual activity of any kind on your part between the possible abuse when you were three and now.
Frankly I think you should stay away from this whole business, except for continuing to work with your therapist, and let your cousin, if he was abused and can remember it clearly, be the one who deals with it, IF he so chooses.
You're just too far from it all, and a three year old's memories recovered when the person is 26.... it's so very hard to work with someone who is this young even right when the alleged abuse occurs, it has to be pretty much based on physical evidence, not so much testimony from the victim, and to wait twenty three years and then try to recall it or file charges against someone with no real supporting evidence or correlation is pretty much going to be impossible.
Just stay away from your uncle. Make sure you never, if you have children, allow them or any other younger family members to spend any time with this uncle. Stay in counseling.