I've been experiencing redness around my urethral opening, irritation on the top of the head of my penis and a roughness (tiny raised texture) of the skin there that seems to come and going during the day. Mornings are fine but irritation sets in over the course of the day. I've also had discomfort in one testicle that was worse weeks ago but has ebbed substantially. Negative for all STD's, both urine and blood panels. Any idea what's causing this irritation. It's small but highly annoyIng!! Help!