I have a mole on my arm. It started to go crusty and bled a little then looked like it was healing. Now it is raised a bit like a spot, very pink, unlike the original brown mole, it has a little white dot in the middle, again like a spot but not, and it’s tender-ish and a bit itchy. I’ve made an appointment with the GP but it’s not for about three weeks. How worried should I be?