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Pain in clitoral region is due to infection which may be associated with urinary tract infection
. It may not be STI. It may be due to poor hygiene during periods, tight underclothing etc.. i suggest you to see a doctor for an examination , as you may need a dose of antibiotics and local application as well , make sure you drink enough amount of water and do not irritate the mucosa , avoid soaps over the area and wear loose cotton under garments . Also get yourself tested for blood sugar to rule out diabetes
. Take care.