If you suspect that you have developed actinic keratosis, it is important to contact a dermatologist and avoid sun exposure until your appointment.
There are several different treatments that the dermatologist may suggest. One of these is imiquimod cream. This cream modifies the body's immune response and is highly effective in making solar keratoses disappear. Another treatment option is cryotherapy, where the doctor freezes the spots using liquid nitrogen.
PDT (photodynamic therapy) treatment is also an option. This is a modified form of light therapy, where a chemical treatment is applied beforehand to make the skin light-sensitive. PDT treatment is particularly beneficial in areas where you want to avoid scarring or loss of pigmentation. While the treatment can be relatively expensive, it is well suited for actinic keratoses on the face.
If your doctor suspects cancer, it is easy to submit a biopsy to the laboratory for testing.