Mole removal after a picture

Hi everyone! 

I have been reading through this forum and I’m wondering if anyone could help me put my mind at rest. 
im a 28 year old female with a mole that has grown, changed shape and colour it is now a dark brown nearly black just located at the top of my arm pit

I’ve been to a dermatologist clinic and they took pictures and told me there was a few vessels and veins under it. 
I’m having it removed next Monday 27th and sent for urgent biopsies. 
I am just wondering if anyone’s experienced anything similar and if their outcome was good news or bad news? 
I also find the same arm pit aches quite often… 

any help is help for me. Thankyou x