psoriasis
"I was diagnosed with Psoriasis on my knee by my dermatologist almsot 7 years ago, and he prescribed Cordran tape for me.  It took about 10 months or so, but the spreading of the psoriasis (caused by me itching at it while I was sleeping) stopped and my skin healed.  I no longer use Cordran tape, as now the only symptom I ever have is a slight itchy feeling every once in a while.  This stuff is great!"