For any skin cancer, the patient must see the dermatologist in three months for a skin exam. If you are clear of basal cell or squamous cell carcinoma in that time, the doctor will probably ask to see you again in six months. If at that time you are cancer-free, an annual exam will be fine. But all patients should be checking their own skin and protecting themselves by staying out of the sun and wearing sunscreen every day, since the chance of developing any kind of skin cancer again is higher for them. Topical tretinoin, or retinoic acid, has also been prescribed to help prevent the recurrence of nonmelanoma skin cancers.