What Is The Sensitive And Itchy Dark Spot On The Clitoris?

I just discovered a dark spot on my clitoris that is dark like a mole. I have had itchiness for about a week and just noticed the dark spot today, so I don't know exactly how long it's been there, but I know it hasn't been there long. The dark spot is sensitive and itchy. What do you think? I have had one sexual partner for the last 5 years and am 99% sure he has not been with anyone else. Also, am not particularly sexually active at the moment.