Is it all the leaves or just the couple there ? That's a new one on me do you have any bugs....it looks like something "oozed" it's way around the edges munching on your girl...BTW welcome to RIU are you new to growing as well as this site? I'm wondering why you chose the nft system instead of soil?Indoors, humidity about 40 - 55%, nft system, temps about 23 - 38 degrees celcius.
Good catch I'm high and a lazy american so I didn't do the conversion but hey ya that's too fuckin hot IMO it should be no more than 27C in there, and do you have a fan blowin on her?38!!!? Tooo hot! Way too hot. That's your problem, if that's not a typo...