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Use "birthmarks" in a sentence
"Not to support state-mandated coverage creep, but port wine stain birthmarks can actually be a serious medical problem."
"Nice profile, it’s not everyday one sees such pride in birthmarks …. there’s a certain je ne sais quoi feel about her (in a totally not Liv Tyler manner of speaking)."
"He says no identifying features, such as birthmarks, scars or tattoos."