I have a flat dark pigmentation on the side of my heel that is about 6mm in size. It appeared when I was about 13-14 years old (I'm 24 now). It's always been somewhat irregular on the edges, medium brown and almost has a liney or striated look. I had it checked several times when I was younger but it never changed.
Recently I noticed that there are a few small jagged edges where the pigmentation is 'bleeding' into the surrounding skin. I also noticed a lighter area inside the mole and a few darker brown specks.
I had it checked by my doctor, who said not to worry unless it grew more or started to rise up above the skin (it's pretty much completely flat right now, you can barely feel it if you run a finger over it).
I'd like to stop worrying about it, but there is some pain in and around the area (not when I touch it, just now and then throughout the day I feel a sort of tingly pain there now and then). I've also been having dull pain throughout my foot that seems to originate from that area.
Should I get a second opinion? I want to trust my doctor, but I am still concerned.
I can provide pictures if necessary.