The immediate assumption is improper hygiene, but it could be some sort of disease or something. If it's a chronic issue and severe enough to warrant soliciting input, I'd advise seeing a doctor.
“awesome jerking off love your butt, BUT it didn't look clean enough and may not be smoothe enough but sexy none the less loved the vid of yu flabby bely and th brest like packs mm. soo god that cok i'd love o suck“