Why Does my Skin Feel Tight in the Morning?

I had a liposuction done on my triceps, upper back and upper and lower abdomen on Thursday feb 21st. For the first 2 days after when I wake up in the mornings my skin was fine. I mean aside from the bruising and swelling. But now all of a sudden for the last 2 mornings when I wake up the skin around my arms feels extremely tight. I have to sit up for 2 min. to get the tightness to go away. Is that normal?