Please Help ASAP!!

I have been growing for about 6 months now and i have one girl that is harvesting in acouple of weeks, my girl has started to get little yellow burn like marks on her leaves, but I havent noticed any spider mites but i have seen these very very tiny little white cattipillar looking things, ive only seen acouple on some of my clones, and I have cut off all the other infected leaves on my other plants, I was wondering if this is a bug problem or nuet problems becasue i do not see any yellow burnish marks on other plants except for some slim looking shit, please i am new and would really appreciate any help i can get to protect all my females.
 
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