Swollen, bumpy lips?

Often, when I wake up in the morning, my lips will be swollen, covered in poison-oak-like bumps, and crazy itchy. A lot of times dead skin will also be peeling, but I think that's unrelated. The swelling and bumps usually go down by noonish. Any idea what's causing this?! It's so uncomfortable and it makes me look like I just got horrific lip injections.