I've had a handful of basil cell carcinoma spots removed from my face, as well as dozens of pre-cancerous actinic keratosis spots, and I'm only 44. I have a top notch dermatologist (have been through several), and she's recommended that I use any sunblock that's SPF 30+ and, most importantly, that the active ingredients are titanium dioxide and/or zinc oxide. The research I've read suggests the same, so I've been following that regimen for the past few years to prevent further sun damage.

I'm guessing the cream you're referring to is Aldara (imiquimod). I've had great success with that stuff, though I know there can be some negative side effects.

Hats and sun block from now on!