<s>[INST] I have been seeing black fluffy like specks in my semen, I thought it probably was just blood, but it has been showing up for months, I am virgin and i do not have any STD, i am pretty worried about this, what do i have?also, I have back pain, it gets pretty bad after i masturbate, maybe I could have an infection? [/INST] HelloI appreciate your concern.Looking at your description, you might have got infection of urogenital tract, may be due to poor hygiene during masturbation.In my opinion you should go for urine test for microscopy and culture.according to reports, you may require a course of antibiotics under medical supervision.Meanwhile take plenty of fluids 3 to 5 liters per day either plain water or fruit juices, which will help by flushing off the urogenital tract.Maintain good hygiene.Hope I could answer your question, please feel free to ask for further clarification.Best wishes </s>