
It is too tiny to either diagnose or worry about it being a Melanoma, My Melanoma was already raised jet,shiny black and large when I noticed it. Still waited 6 months before having it taken out. Before that I had noticed a red ring round the base of it which next day had already darkened and another red ring had formed - this is how it was growing. Also it had a secondary on top of itself called a satellite which I had thought was a little soft wart.
I once had a small hard black raised spot on my back so could not see it and GP was suspicious so referred me.
I had to laugh as it was indeed a blackhead and the specialist squeezed it out for me ! It was bigger than your pin prick sized spot. Keep an eye on it to see if it grows and changes but I doubt it.
Good luck