What Causes Moles On The Inner Thighs?

I have noticed, in the last year, tags or moles on my inner thighs. It started since I gained weight. At first it would be just one on either side then go away. Now I have atleast two on each side. They irritate me when my thighs rub together, when it gets warm or I sweat. Shaving really irritates them! I have been using baby powder to stay dry. Other than that there is no pain. But they are really ugly to me. Just the other day I noticed they looked purple not flesh colored. What is this and how can I get them to go away?