This is an intent-to-treat, split-plot design, multicenter randomized trial and the primary
intervention is a double-blind comparison of Imiquimod (IMQ) vs. placebo cream for preventing
basal cell carcinoma (BCC) of the skin on the face at one year and over 3 years after
therapy. Participants will apply the IMQ or placebo cream to the face daily at bedtime for 12
weeks. This study will recruit 1630 Veterans at high risk of BCC from 17 VA medical centers.