just blemishes on older / early leaves.
blackmind -- if you look back here... if it is spreading, google "leaf miners" and see if that is what you are seeing. this has a couple spots that look like it could be caused by that particular pest, but 99% sure it's just some blotchiness of early leaves and will grow out of it.
if thos sort of thing continues and doesn't really match nute symptoms, it could be genetic issue in the plant... think of it similar to a diabetic human etc.. can't quite process soemthing that is necessary or not processing it efficiently etc. if it's not spreading to other plants, it's unlikely a pest or infection. having a nute formula you know works well helps eliminate other potential causes to this, otherwise it's hard to know if self-inflicted or not.