I just finished masturbating. There are two cuts (always two cuts) parallel to each other.3-4mm wide and about the same length. Starting at the prepuce (hole) and going 3mm or so down the centre of my shaft. Why do I get these? I never used to, its within the last few months. They heal in a few days but its annoying me. From the little I've been able to find, it could be because of a tight foreskin (not TOO tight, I have unprotected sex etc fine) or that my glans is too big for the foreskin around it and is causing tears. I'm guessing its the head thing, its quite small flaccid and grows quite a bit when hard. I sometimes think its small because my tight(ish) foreskin restricts it from growing? There is no pain when masturbating or when the cuts appear, they just do. Any diagnosis or advice? Thanks.