Surgery
Surgery is the most common treatment of skin cancer.  The surgery is meant to remove the cancerous area while preserving nearby skin tissue. The wound is then sewn up (or a skin graft can be applied if it is a larger area) and the scarring is usually very minimal. 

Curettage and Electrosurgery
Curettage is a less invasive surgical process which involves scraping off the top layer of effected cells.  Electrosurgery is when you burn the cancerous tissues with an electric current.  Often the two will be used together to first scrape away the cancerous area and then burn the cells beneath in case there are any cancer cells remaining. 

Cyrosurgery
The process of cryosurgery is one which uses liquid nitrogen to freeze off damages cells.  This is typically used in precancerous areas of skin and not ones where the cancer has already formed.

Radiation Therapy
Radiation therapy uses high-energy x-rays to kill or shrink cancer cells.  This method works gradually and can take as many as 15-30 visits.  It is not commonly used on skin cancers but if there are special circumstances like an unusually large area to be treated or a reoccurring skin cancer your physician may recommend it.   

Chemotherapy
In some cases chemotherapy may be prescribed for skin cancer, but it is less common.  Chemotherapy is basically a method for which medication is prescribed to try to poison the cancer cells.  It can be administered orally, through an IV, or can be used topically (on the surface of the skin).  Because of its side effects, chemotherapy is usually not the first choice for skin cancer.