Yea, would not worry too much about that, especially if its isolated and been there a while, the little crunchy burnt spot looks like something other than common pest problems / damage
thanks guys im going to look out for all of those possibilities. they are looking so good other then those little spots. but they have been there for about a month and the are growing like crazy, just cant any height on them really. i plant on switching to flower in about a week and they are only about 7 inches tall