Should We Express Concern Over Mole In Buttocks?

I recently found a mole on the inside of my butt. It is rather large, about the size of a pencil eraser, raised and a brownish/red color. Should I be concerned? I have a slight history of abnormal moles, one mildly dysplastic and recently a Spitz Nevis (which I am told is fairly rare in someone my age...I am 30).