hi..thanks for your query From what you describe , it might be pseudofolliculitis in the inner thighs.It is frequently caused by ingrowing hair ,meaning that after waxing/shaving or any method of hair removal , the hair grows along the backward direction and creates a inflammation in the surrounding skin.It heals by leaving a dark spot called post inflammatory hyper pigmentation.So you should stop the above hair removal methods if you are following it. I do not think it is due to vaginal infection. If you have weight gain due to PCOD , you might get more pseudo-folliculitis. Hope this is helpful.Take care.