There was a comment like a thread or two ago where an anon asked if Star's cheeks are supposed to represent where she'd blush and if so, is it wrong when S4 or whatever draws the blush on top of them. A few anons said yes.
THIS IS FALSE.
Star has been drawn blushing on top of her hearts since literally Season 1, pic related-- the more purple blush lines are on top of the hearts there. The marks CAN light up red when a character is incredibly turned on, such as Eclipsa during the trial or Star in Running with Scissors, but in general when a character is blushing, the blush extends over the mark because it's just part of their skin. It's like how Star's marks can temporarily turn into stop signs or other things: the blushing red is just a separate effect from normal blushing.
It's understandable to think the hearts represent cartoon rosy cheeks because of their color being somewhat red/flesh-toned, but it's just coincidence considering other characters like Dirhhennia, Solaria, etc. show that the marks can come in a variety of colors. S3 and S4 fucked up a lot of things, but blushing over the hearts is something that's been done since the very beginning of the show and isn't wrong. The hearts/spades/whatever blushing red on their own isn't wrong too, but it's not the only way the show depicts blushing and seems to be reserved for full-on lust specifically.