Hi Dave, WELCOME

I had 3 skin cancers - basal cell - removed a little over 6 months ago. My body has always made "things", so I get a dermatology body check every 6-12 months. I have been on Tysabri for 5 1/2 years. I do not have knowledge about skin cancer as a side effect of Ty. Maybe go to Tysabri.com for the side effects.
Best wishes
Linda