can you tell me what this is???

I was moving some females around the other day and noticed this on one of my girls, it looks like brown rusty spots. sorry pics aren't that great. i am currently in my third week of flowering under 1000w hps.

I think you nailed it in your description. It looks like rust fungus. If it is, you will see a corresponding blister (raised bump) on the underside of the leaf. It spreads pretty rapidly. I have dealt with this in the past. I used a mixture of baking soda and horticultural oil. It really didn't seem to affect the spread IMO. Further reading about rust on edibles indicates that the fruits of plants affected by rust are still edible. It seemed to arrive at my last two weeks of flowering. Looking inside my buds I saw no evidence there; I suppose due to the bud cluster being so tight the spores couldn't get in there. It is quite common in the spring on a multitude of plants and trees, so it probably came in with you. It does rob the plant of nutrients. There are a lot of gardening sites online that discuss control.

i been doing some research and just about everything i read has lead me to believe that it is a mag deficency. if anyone has any imformation on this it would be greatly appriciated. it is a sativa plant about 50" tall if that helps

That was gonna be my 2nd guess, sorry, pics just a bit blurry.

Yeah sorry about the pic i have to take them with a phone and then upload to the computer.

If anyone has any other suggestions on what this.could be and how i can fix it please feel free to answer. To all those that have helped so far your help is greatly appriciated

Bump need to figure this out so i can take action don't wanna screw up and kill it.

ok so here is a better pic of what is going on with my plant. if anyone can help me figure this out it would be great. i don't want her to die and the problem is not going away since i have no idea what could be wrong. i want to figure this out so i can do something about it but i need more advice to what this could be before i do something that will really mess her up.

Someone has to know what this is. is it a big problem little problem??????

Did you spray water during light ?