I was diagnosed with melanoma 3.5 years ago on my foot, 1.4mm thick and staged at 1B. I had a lymph node removed which was negative.

last week I found a lump on my shin, roughly the size of a 50 pence piece, it is tender & red. I can move it slightly. I am absolutely terrified that this is a reoccurrence of my melanoma. 
 

I have been to the GP and he isn't too concerned and thinks it's a dermoid cyst. He has referred me to get the lump removed but this could be up to two weeks. I really don't know how I am going to cope waiting so long for results! Has anyone else been in a similar situation?