I would have thought that men using nail files is about as common as men using nail varnish – not very.
I usually use a knife, but still get rough bits that snag annoyingly on synthetics, so I use a file.
Which could be a nail file, but equally could be the file on my Swiss Army Knife, or a flat needle file. Just depends on what’s handy. Having a ragged nail that scratches, or catches on something and rips off and bleeds is just unnecessary.
Oh, and as I’ve got older, I’ve developed allergies, specifically hay fever, but equally, I used to get a sort of UV eczema on my hands, across the knuckles. Come April, without fail, I’d get these little pimples come up, with white heads, that would then cause the skin to go red and itchy, and split and flake. It would disappear around October, every year, regular as clockwork, but I don’t get it now. Wierd.
Think I’d rather have the hay fever; at least Wilco’s do cheap tablets that ease it, I could never find anything that stopped my hands getting sore.