Understanding a 2 mm melanoma

The 2 mm figure usually refers to Breslow thickness: the measured depth of melanoma cells in the removed tissue. It is not the width of the mole and does not, by itself, show whether melanoma has reached lymph nodes or another organ.

The pathology report also records whether the surface is ulcerated and may include other microscopic features. Final staging combines the primary tumour findings with any relevant lymph-node or distant-disease assessment, so two melanomas with the same thickness can receive different stage descriptions.

A specialist normally reviews the original biopsy and arranges wider surgical excision around the biopsy site. The team may discuss sentinel lymph node biopsy to check the first draining node for microscopic melanoma; the decision reflects the complete pathology, your health and the likely value of the result.

Bring the pathology report and medication list to the appointment. Check the skin and nearby lymph-node areas as instructed, protect skin from ultraviolet exposure, and attend planned surveillance. Systemic treatment such as immunotherapy is considered according to confirmed stage and risk features, not thickness in isolation.

Do not delay the scheduled melanoma appointment. Contact the team sooner for an enlarging lump near the scar or in a lymph-node area, a new or changing pigmented lesion, persistent bleeding at the site, or wound redness, heat, discharge or worsening pain after surgery. Sudden severe neurological or breathing symptoms require emergency assessment regardless of their cause.

Ask whether 2 mm is the final Breslow thickness, whether ulceration was present, whether the biopsy fully sampled the lesion, and what stage is confirmed so far. Request an explanation of the excision plan, the benefits and limitations of sentinel node biopsy, and the follow-up schedule after treatment.