It still baffles me why we have more ability to customize pets than skin tone though. Ideally, a skin tone slider would be great but I know that is more complex to implement then fixing existing textures. It is clear these blushes were not tested properly, and if they were tested on dark skin tones and still rolled out that is a completely other issue that should be looked into.
Also, all of the MAC collab blushes cause weird issues with dark skin tones, from patches of discoloration to straight up lines on the skin texture. Please fix the existing skin tones (cc creators fixed the errors within 24 hours, your team can too). Your messages of standing with the black community would mean a lot more if you actually showed you cared about representation in the game.
On almost all the dark skin tones there is a patch of discoloration between the brows, and below the sim's right nostril. The skin tone update for the Sims 4 came out in early 2018. Information, Guides and Announcements for the EA app.