Should i get a second opinion?

I have a mole on my back (top left shoulder). 

 

It was never raised and now it's raised and hard / crusty, it looked as if it could or had been bleeding and it's been itchy. 

 

I sent a photo as best as i could take of it and my doctor said i that it's not cancerous. Can they really tell from a photo? 

 

Still a very concerned person!!