If you are concerned about certain spots on your body, make an appointment with your doctor. The doctor can then examine the spots more closely. They will look for moles, birthmarks, or spots that could be cancerous. You will need to remove your clothing so the doctor can do the physical exam of your entire body, from head to toe. The doctor may do a biopsy on any suspicious spots, moles, or bumps. They will take a small sample of the spot and bring it to a lab for testing. The biopsy will allow the doctor to determine if cancerous cells are present, and if so, what type of cancer is present. If the doctor confirms you have skin cancer, they will do more tests to determine the stage of the cancer. The doctor will then recommend treatment based on the stage of the cancer. The main form of treatment for skin cancer is surgery to remove the cancerous spot or spots. In some cases where the cancer covers a wide area of your skin, you may also need radiotherapy or chemotherapy.

Summary:
Allow your doctor to examine your body for spots. Let the doctor run tests on any spots, moles, or bumps. Get a diagnosis from the doctor.