Could it be cancer?
As a very pale caucasian and a blonde, I am at an increased risk for skin cancer. I try pretty hard to keep the sunscreen on, but my love of warmth causes me to burn a bit.
With my last pregnancy I had a funny mole that changed substantially. It grew, changed shape and even got a funny black spot in it.
So I went to the dermatologist and he called the mole suspicious. He then suggested a shave biopsy.
Now my ugly possibly cancerous mole is now a hideous spot on my back that hopefully wont scar too much.