I haven't been on Humira, but I'm on Remicade. I get this problem, too. My dermatologist gave me a prescription for Aczone that helped a lot.
"For this thing I besought the Lord thrice that it depart from me. He said, My grace is sufficient for thee: for my strength is made perfect in weakness. Most gladly therefore will I rather glory in my infirmities; I take pleasure in infirmities, reproaches, necessities, persecutions, distresses, for when I am weak, then am I strong" 2 Cor