Mole urgent referral

Hi 

my son is 12 years old and have to attend an urgent referral to the dermatologist for a mole around 7mm. He has quite a few but this one has grown over the years from what was a large freckle at 3 year old. 
im beyond worried that this is melanoma. Can't eat or sleep with worry. 
has anyone else had this with their child 

 

worried mum