I have Mars in Capricorn conjunct my Ascendant. It rules my 4th and 11th houses.
I had a horrific bicycle accident in childhood (4th house) on my way to visit a friend (11th house). I still have a scar on my left cheek with gravel and dirt in it - also on my left elbow, for that matter.
My nose is still slightly off because a schoolmate busted me in the nose in high school.
Plus, I've received many other hard knocks to my head over my lifetime.
But I agree with Frank - the Mars influence could happen at anytime. Also, I don't believe that it is a given that one will develop a scar. It's just like Mercury Rx, in my opinion - things are much
more likely to go wrong during Mercury Rx, BUT they may not! So, in having Mars on the Ascendant- I believe that one is much more likely to have one or more incidents that would cause scars to the fact, BUT it may not. There may be other positive, mitigating factors that would protect one from Mars influence, as well - decreasing the chance of scarring.
Quoting Starlink:
I wonder about people who do have a visible scar in their face but do not have Mars in the 1st house. My partner has a big scar just a bit underneath his chin (a Cricket ball hit him there, as well as a golfstick, so twice same spot. Big scarr there.) His face also has lots of blemishes, but is not red.His mars is in Leo in the 10th and his Asc. in Virgo or Libra (I think Libra. Still not 100% sure) but he has Chiron at 7° in his 1st house and Mars exactly squares that Chiron. Would that also be a reason for a scar?
I think there are probably several other aspects that can tend to produce a scar on the fact besides Mars on the Ascendant. In my opinion, Mars exactly square Chiron would definitely be one of them.