Got my first ingrown hair in ages. I did tweak my last shave though.
All passes on the least aggressive Razor setting. (Merkur Progress normally on mid setting)
The blade had done 5 shaves. (Normally I replace after 3)
I tried shave oil as part of my prep.
Which is most likely the cause of the ingrown hair?
It was a really good shave otherwise.
I'm used to multi-blade shaving, so please feel free to take this with as big a pinch of salt as you wish, but I only ever get ingrowers after I've gone ATG.
In fact I had to dig one out this morning and I know for certain that it was because I was being OCD for some godforsaken reason a couple weeks ago and went full ATG potato.