Assuming he *actually* goes to the range...
I can understand blisters on the fingers, the inside of the palm because of friction and recoil. But blisters along the side of the index finger? You also mean to tell me that a man as "wealthy" as he is, wouldn't buy some gloves when shooting? Well, this is the guy who advocated against wearing masks, so no surprise there. You also don't think there'd be photos of him at said range?
But which is more likely... Him getting blisters from a gun range despite only having held a gun for a photo op? Or, getting an STD knowing his history of adultery and purchasing of prostitution?
I'd bet my bank account, given the two, I would say that the latter is far more likely. Neither would surprise me. The latter is far more comical and much better in Karma. Also makes sense with how he completely went off the rails rambling about how banks are trying to "Debank you for your political beliefs."
Interesting take though, I hadn't considered that and will acknowledge this as a possibility, but not factual (yet.)