Leaves around buds turning yellow. Help

Can anyone tell me about this? Only happening to one plant.

can you give us more information, strain, ph, nutes?, lights?, humidity, what part of the room is it near, personally i think its nothing to be worried about but i have little to no information on the plant

Im not sure about the strain some kind of purple. I am using sugar peak flowering. 400w hps. Humidity is between 35 and 45. It was in the very corner of my grow room but i just moved it out yesterday.

I know its a quick short cut and no-one really wants shorts cuts but you could just add some (a splash of) GROW nutrient (whatever brand you use) because it just looks like a deficiency but without good info like sunni said there's not much I can tell you, Are you checking PH with self test kit or digital PH pen?, are you active hydro, soil or coco. Some good bud there though brother would love to see a picture of the others.
Although if you do use hydro and this did only happen to one plant then who knows blocked dripper?

iron usually starts from the inside.

Thanks for the fast replies. I am using happy frog soil. The ph is fine. This is the only plant that is doing this. Just doesnt look right to me.

Its a mistery to me I hope some one on here can help you.