For folks with seborrheic dermatitis, it can be beneficial to make your cream base from 100% grass-fed beef tallow.  It's full of vitamins, collagen, & more goodies for the skin...  a perfect carrier for the canna, as all is absorbed within a few minutes.  The skin literally drinks it in.  
I have a crazy theory - if you can't eat it, you shouldn't put it on your skin.  Your digestive tract has acids for defense; your skin absorbs whatever you put on it.  Weighing in at 9 lbs., it's your body's largest organ... and the most neglected, it seems.