Everyone has pimples sometimes but if it is severe it makes you loose some attractiveness. I would suggest seeing a dermatologist and switching up your skin care routine. Switch to Sulfate free shampoos as most shampoos have sulfate which is the same thing that laundry detergent has and it strips away the skin's natural oil which makes acne worse. Also remember to wash your face in the morning and at night, stop drinking soda and sugary drinks, clean up your diet. And there are massages you can do with Chinese spoons to reduce forehead lines , those also help reduce toxins in the face, I use it to make my face thinner but it works for those things too. I'll link it to you in the bottom and I will also link you a make up tutorial for people with severe acne.
Pimples can be unattractive, and I can see how for a lot of guys it is a problem. For me, it's not that big of a problem, but I would want her to clear up her skin for her own good, just like I would of mine. As for pimple marks, nah... no biggie. Neither are a deal-breaker for me. Shit happens in life, and acne is part of that. I wouldn't find it attractive, but I wouldn't see it as a problem, but I know that there are guys that will find a problem with it.