Hello i had gone through your question and i can understand your concern this lump at clitoris could be due to STI i would like further information to help you better like your age history of unprotected intercourse Does it bleed or discharge in my opinion you should consult your gynaecologist for examination and investigations like blood for hemoglobin and CBC urine test for culture and sensitivity you may require a course of antibiotics with antiseptic solutions to be washed witg and applied locally maintain good hygiene Hot water bath will be helpful wishing you good health