You might consider taking a hydrogen peroxide sitz bath once daily for 20 minutes, for a week. Add 1 cup of hydrogen peroxide (3% solution) to a small warm bath. It can help bring down swelling and decrease the risk of further infection. Wear cotton underwear; don't wear tight fitting clothing. Something else to consider is whenever you masturbate, make sure your nails are clipped and/or whatever object you might use are very clean before use. Stay away from porous objects that allow bacteria to easily cling to them; avoid rubber, jelly, and vinyl toys. Also, use a water-based lubricant to reduce further irritation and dry friction.
You are irritating yourself. And you have a cut and not giving it time to heal. Maybe find a new way to masturbate and recording it? Not sure why that would be necessary. Young women who record things like that expose themselves to risk. Someone finds it and posts it? If you send it to anyone, even someone you trust, it could be then at any point, made public. NO ONE is trustworthy to have your 'tape' of masturbating. You can look at yourself with a mirror if you feel it is necessary to examine when you are having pain/strange symptoms. good luck