<s>[INST] hy there im 29 yrs of 55 height and 63kg i suddently had a small swell and wound in private place which lasted for 3 days. i feared and checked to skin doctor he said noting to worry. then i did a blood test  Hiv and and VDRL was tested and i got VDRL-non reactive and HIV Negative. shuld i be worried [/INST] HI, thanks for using Chat Doctor The most common sexually transmitted infections are chlamydia, gonorrhea, HIV, herpes, syphilis, trachomas, hepatitis. These would not normally present with swelling in the genital region, so they are unlikely the cause of the swelling. Some the infections (chlamydia and gonorrhea) may actually be silent and not present with any symptoms at all. If you wish to be completely sure there no infections present, you can screen for all of them. I hope this helps </s>