It depends on where it is in the body, how wide of margins they’re going for , and if you need lymph node biopsies. For thickness <0.8 mm lymph node biopsies are not recommended. The margins are recommended per tumor thickness and can be anywhere from 0.5 cm to 2 cm. My melanoma was on my scalp, needed 1 cm margins, and needed neck lymph node biopsies so I was referred to a head/neck surgeon. If I have another melanoma and it’s thin and on a body part like stomach or leg I would be fine having a dermatologist do it. If you’re being referred out that can take longer to get an appointment, have the consultation, etc so it may make more sense to stay with the derm you’re established with.