Is this a mole on my vagina or something else? (Photo)

It is important to get periodic skin checks and look for changes in moles and other spots that may be signs of skin problems.  There changes to look for are the ABCDs, which stand for Asymmetry, Border Irregularity, Color change and Diameter increases. In the photo the spot look like a mole but it is difficult to say for sure. It hard to take a good picture down. The best way to would be to have it checked by a doctor. 

The fact that you have had this pigmented area on you vagina for so long suggests it likely is benign, but I recommend you have it evaluated by your gynecologist or a general surgeon and consider biopsy to definitively rule out a cancer or precancer. Good luck and take care.