Table 11.

Recommended surgical margins for primary cutaneous melanoma.

Tumor thickness	Surgical margins*
In situ	0.5–1 cm**
≤1 mm	1 cm
1–2 mm	1–2 cm
>2 mm	2 cm

^*Surgical margins are considered as measured during surgery from the edge of the lesion or post-excisional biopsy site.

^**For large or poorly defined melanoma in situ, lentigo maligna type, a surgical margin or more than 0.5 cm can be considered.

Consider histologic margin assessment prior to reconstruction and closure (Adapted from the Cutaneous Melanoma NCCN Guidelines, Version 4.2020).¹⁰⁵