According to survival rates you were told, I guess you are having an early stage of melanoma.
Lymph nodes biopsy of the regional lymph nodes is usually performed to check for local metastases.
You should ask to get checked for melanoma metastasis, cause there are cases when thin melanoma has spread distantly.
You dermatologist is probably familiar with serological, immunohystochemical and histological prognostic markers.
The annual risk of recurrence for tumors <1.5 mm thick remains <6% for the first five years dropping to under 1% for the next five years.