pitted with

[jacdac]

“Attention!” Doug Brodesseur had a high, nasal voice, pale skin pitted with acne scars and curly black hair, and was all of five feet, three inches tall.
source: Mrs Everything by Jennifer Weiner

are the expressions pockmarked and pitted with acne scars interchangeable? Which one is more colloquial? the latter?

Thank you.

 

[Uncle Jack]

are the expressions pockmarked and pitted with acne scars interchangeable?

Not quite; the latter is more accurate, if that is what the marks actually are. I don't recall having seen "pockmarked" used recently, not for a person's skin at any rate. I wonder if it is now thought to be derogatory.

 

[WestSideGal]

are the expressions pockmarked and pitted with acne scars interchangeable? Which one is more colloquial? the latter?

For me they are the same, and one is not more colloquial than the other. They both mean "bad skin".