Melanoma 1a

Hello, I’m 32, and by a total chance I had my melanoma spotted, and removed. To say that the diagnosis was a shock is an understatement. 

im seeing a consultant about WLE in two days. My mole was 0.5mm breslow depth, superficial spreading, no ulceration , clear margins. I was already told lymph biopsy is not offered for those types but I can discuss them still. 

I want to understand more about why wouldn’t one want one? This is the only way to know whether it’s in the lymph nodes in any capacity and can spread?? 

thsnk you in advance for any help and advice