Oh poor you - I know it is a worry.
It could be a ingrown hair or spot underneath the mole, I suppose. However you are right to go to teh GP and have it checked, I imagine that they will refer you to a dermatlogost.
I had a melanoma on my face about 18 months ago. Was referred to hospital - was seen about 10 days later. Went in, they looked at the mole under some kind of microscope thing that they pressed against it, said it looked 'active' and advised that I had it cut out. They did it there and then - the doctor and nurse were very kind. It was then sent off to a lab, found to be malignant, and i had to go back and have more excised. They analysed this and were satisfied that all was out, I now go for annual check ups to check the other moles on my body for any symptoms.
The scar took a while to heal (and felt painful for ages, strangely) however it is now ok and is easily covered by normal concealer. It did look angry for about 9 months though.
Sorry - rambling on there, but what I think I am trying to say that if it is something sinister it is dealt with easily and quickly, there is no wiating about. So please don't worry (easy for me to say, I was worried sick at the time) as I am suer you will be OK if you find out that the mole is 'something'.
I do have a dread fear that I will have another mole go funny on me - I spent most of my childhood on the beach, both in the UK and in the tropics, where I was sunburned very badly. I wear factor 50 every day now and never sunbathe any more (and make sure dd is slathered in the stuff as well). But I do constatntly keep an eye on moles and freckles and worry if they look a bit odd, which I suppose is good, as it makes me vigilant.
Sorry that you hsavet his to worry about Orm - hopefully you won't hjave to wait about too long before you get it sorted.