Whats causing this?

Ok, i sprayed with pyrethrin bout a week ago heavier than i shouldvr those patches started showing up, but id almost say its getting worse, maybe im just stoned.

lower part of the plant and it don't look fresh damage so I wouldn't worry at this stage
you could always give the plant a good spray with water as this would clean the leaves if your worried

often use pyrethrin on my plants and its good stuff, kill bugs and get the job done