Plantar warts are found on the feet.
The only way to know for sure if this is genital warts is to get it biopsied for a strain. I doubt any doctor will do that, but you can ask. If its in the genital area, its most likely genital warts.
Aj
I guess I was trying to figure out if the inner thigh counted as "genital area"
If its up by the scrotum, then yes. If its down by your knees, probably not.
Aj