It depends as to which organ drainage the lymph node has. If
there is only one lymph node needed say for histological test or
biopsy only one incision is fine. But i think, generally it takes
only one incision.
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If it is 1-2 mm, node dissection may be done at the time of
primary treatment or the patient may be observed and only undergo
lymph node dissection if the area later shows signs of disease.
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Lymphadenectomy, also called lymph node dissection, is a
surgical procedure in which lymph glands are removed from the body
and examined for the presence of cancerous cells.