What does this?!

this is the second grow that this happens.(the pic is from the first) seems like something is eating inside the leaf. (1st time that occurred on the crop as i remember i treated it with soap water...then jusi i ignored it )
got any idea what it is and any solution?
thanks

looks like leaf miners, use some insecticide soap.
if there is no improvement bust out the big guns, get some pyrethin spray, I use Dr.Doom pyrethin spray.

dr doom haha sounds like it does the job

thank you for the quick reply........i will get on it as soon as possible (hopefully tomorrow i can get insecticide)