Dry Penis

Hey gals! I was hoping y'all would be able to enlighten me with some experience and knowledge about this topic because I'm so new to boyfriend and sex and all that jazz!

Here's the low down:

Been with boyfriend for almost a year and we've been sexual for just over half of our time together. There's sex and blowjobs and great tongue work! Woohoo!

BUT

Recently (the past 2 or so weeks), I've noticed that his penis is dry! Like the head of his penis is dry and I can feel the texture difference with my tongue and see it too. I've seen it where it looks a little irritated.

So is it that I give him blowjobs too often? I'd say I give about 3-4 a week but there are times where I tease him for ages or blow him 2 or 3 times a day to keep him on edge for later.

Did I do this? XD He hasn't said anything at all, mentioned any discomfort or pushed me away from his dick so I feel like he either hasn't noticed it or isn't worried about it

Halp!