Asked a few different questions like many posters do about general concerns after contact etc. Had some irritation a few days after protected contact. Was prescribed zpack and suprax. Developed white tongue - could be thrush - not sure. Was put on nystatin. Cleared up (mostly). For the last few days, I've noticed the tip of my penis is faintly red w/ slight burn/irritation. I tested at 3 days and 14 days after contact, all negative. Could the this be thrush in penis, some std, etc. I would really appreciate any thoughts. What, if anything, should I test for again? When should I test (meaning when would those tests be conclusive)?