So you have not had sex or masterbation in a while. When I haven used a shovel in a while I get a callous on my thumb, it has fluid in it. Just pop it and move on.
As for you, there is fluid in a skin area not used to being rubbed lately;) if it turns dark red to black, then worry, but if no skin color change, just dont rub so hard next time;)
I had an issue like that once, im great at body mods, so I just cut in to take a peek and found above issue with clear fluid.. that was after 6 mo of no sex after orchi.. didnt have urge at first, but it all came back too..
If you plan to be srs someday, try using a vibrator with a small cup on the end to cup the end of your penis. I found these great ones made by wahl. I started having better orgasms w/o an erection. From there, your mind can go wild;) the orgasms will change.. this way, after your srs, you already know how to have an orgasm.. happy spanking! I found this and never went back!