What should you know about Mohs surgery and melanoma?

During Mohs, the surgeon removes a thin layer, maps the tissue and examines it before deciding whether another layer is needed. The method can preserve tissue around areas where space is limited. Melanoma decisions also rely on the biopsy report, including tumour depth and subtype, so the technique is not automatically interchangeable with ordinary excision. A specialist may coordinate dermatology, pathology and oncology input.

Mohs is commonly associated with [Basal Cell Carcinoma](/conditions/basal-cell-carcinoma/) and [Squamous Cell Carcinoma](/conditions/squamous-cell-carcinoma/). Its use for melanoma is more selective and should be explained in the context of the individual lesion.

Bring the biopsy result, details of earlier treatment and a complete medicine list. Ask whether the planned procedure aims to remove a local lesion, obtain additional information, or both. Compare the proposed approach with [Surgical Excision](/treatments/surgical-dermatology/excisional-surgery/) and ask how the wound will be closed. Follow the written instructions about eating, medicines, dressings and activity.

Seek a dermatology appointment for a new or changing pigmented lesion, especially one with irregular borders, several colours, bleeding or a persistent sore surface. Following a procedure, report uncontrolled bleeding, marked swelling, pus, fever, increasing warmth, severe pain or a wound that opens. Do not wait for a routine review if symptoms are progressing quickly.

Why is Mohs being proposed for my lesion? What did the biopsy show? How will you assess the margins? Would standard excision give different information? Who will review me after healing?