ROSIE CHEEKS!!?? help? wats it called?

Ok this girl has rosie cute cheeks ALL THE TIME!! She has flawless skin no bumpy face or irritated,,just cute flushed naturally all the time no matter what! And her sister is the same! Its not rosacea, cuz its not bumpy or irrate, just cute flushed all the time..please what is this (scientific name) its driving me crazy :):)