Any Knowledgable Growers Out There Mind Giving Some Insight?

[Isuzumafia]

So my plant has these spots on the leafs that are only getting worse they used to be little blemishes and the strange this is its only affecting the fanleaves on the fourth node. I don't feed it any nutrients except the one in tap water and soil. I have 4 23w cfl's. Here are some pics of the damage.

What do you guys think, it's not worrying me too much since the rest of my plant looks okay I just thought it was strange. Here's what the rest of it looks like it's going on its fourth week since seed.

 

[Og Gong]

Looks like you may of had an insect eating on the sun leaves. Keep an eye on the new growth for new leaf damage. Good luck.