Talk to your doctor tomorrow and tell him of your concerns.
The cream he prescribed is most likely Efudex, which is a topical medication which stops the growth of cancer cells for Basal Cell Carcinoma. So this may be all you need.

Here’s a little article about the medication which might help ease your mind.
https://www.verywellhealth.com/efudex-cream-for-the-treatment-of-skin-cancer-3010838

However, after speaking with the doctor, if you still have qualms by all means have a second opinion. It will ease your mind and give you the reassurance you need.