Definitely looks like pm on some of those leaves! Treating the plant for pm is probably your best bet! There are plenty of simple options like the milk weezy suggested. You can also use hydrogen peroxide. Or there are plenty essential oil options. And lastly the most extreme measure a full blown fungicide. Treating this plant now shouldn't be too hard. But make sure to bleach clean yet entire grow space sk no spore is left to re plague ur garden. Also this leads me to believe u dont have enough air movement in your grow. Think about adding oscillating fans to circulate some more air. You need to improve your environment or else this could be a repeat kinda issue. Definitely gets worse when into bloom. You want to get control of ur grow room before flowering thays for sure. Happy growing and stay lit fam.