Errrr I have a few red marks as well and will use 'make up' on a night out just to cover them up.
However, ime, girls really aren't bothered about this particular physical flaw....I do day game without it and never have problems getting girls.
My theory is this: if there's something about you that subcommunicates bad genes in some way (Bad bone structure, skinniness, shortness etc) then this can count against you with shallow girls. However, if its something purely asthetic, (mild acne, baldness, moles on the face or whatever) then it won't. I've heard it said that clear skin = healthy and disease free but i don't buy that as I've never had a disease ane get ill about once every 5 years.
Like I said this is just a theory...it may be complete BS, but thats what I think based on what I've seen....university gives ample oppurtunity to observe things like this.
Oh btw, try using Apple Cider Vinegar for your red marks. If you've stopped breaking out (I still do a little bit as I'm only 20) then that will clear them up in no time.