The best way to find any suspicious moles on your body is to do a skin self-examination.
If you notice a mole that looks unusual or that has grown or changed color or shape in the last few months, you should tell your doctor. If your doctor also thinks the mole looks suspicious, he or she will refer you to a dermatologist (a physician who specializes in diseases of the skin). The dermatologist may do a biopsy. The dermatologist will remove a small piece of the mole or the entire mole. A pathologist (another special doctor) then looks at the sample under a microscope to check for cancer cells.
If the mole turns out to be melanoma, your dermatologist will need to find out more about the disease, based on:
How thick the tumor is
How far it may have spread
This process is called staging. Staging the melanoma is a very important step because the choice of treatment has a lot to do with the stage of the melanoma.
To find out how thick the melanoma is, the dermatologist or a surgeon will remove the entire tumor along with some skin around it (if this wasn't already done during diagnosis). At the same time, or in a later step, the surgeon may do a procedure called a sentinel lymph node (SLN) biopsy. This will help your doctor find out whether, and where, the melanoma has spread.
Other tests may also play a role in staging. These include:
CT (computed tomography)
MRI (magnetic resonance imaging)
PET scan (positron emission tomography scan)
After all traces of the tumor have been removed, you may see an oncologist, a cancer specialist. If the melanoma has spread to other areas or if there is a good chance the melanoma might come back, the oncologist may prescribe additional treatment.
Typical Steps in the Diagnosis of Melanoma
You find a suspicious mole or growth on your skin. You report it to your doctor.
The doctor refers you to a dermatologist, a skin specialist.
The dermatologist does an excisional biopsy and sends a sample of the growth to the lab. The pathologist at the lab checks the sample under a microscope to see if it is melanoma.
If it is melanoma, the dermatologist refers you to a surgeon for a sentinel lymph node or SLN biopsy. (Sometimes, the surgeon will remove the entire tumor and do the SLN biopsy at the same time, combining steps 3 and 4.)
If the dermatologist or surgeon has not yet removed the entire tumor and some surrounding skin, that happens next.
If tests show that melanoma has spread to nearby lymph nodes, the surgeon may remove those lymph nodes to help stop the cancer from spreading further.
If the melanoma has spread to the lymph nodes, you may have more tests including: blood tests, ultrasound, chest x-rays, or Magnetic Resonance Imaging (MRI) to check if the cancer has also spread to other organs.
After all surgery is completed, an oncologist (a doctor who specializes in cancer) may prescribe other treatments. These are called adjuvant treatments, and they may be in the form of immunotherapy, chemotherapy, or radiation therapy.
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