Bddouglas, I am sorry to read about your squamous cell carcinoma.

Almost always they grow "out but not in".

I have had a couple removed with no subsequent problems. They were probably an effect of sun exposure here and as a matter of routine I check myself for anything which looks dubious.

Squamous cell carcinoma is a known side effect of Rebif treatment but it does not seem to be very common Is SQUAMOUS CELL CARCINOMA a side effect of REBIF ? ( FactMed.com ).