I'm thinking the first picture may be a bit of nute-burn which is little to no problem. Second picture looks like the plant is starting into flowering phase. That is natural and harmless. As the plant gets older it transfers the energy it produces from vegging (growing roots and greenery) to flowering (bud and resin production). Think of it like a teenager growing fuzz on his chin.
I would leave them alone as I don't see any real problems.
Good luck, BigSteve.