I had taken a break from pumping for about 6 months. Maybe less. Several weeks back I decided to take it back up. After I pumped for about 15-20 minutes I noticed a small blister on the tip of my head and one on the topside of my shaft. After a few days it went away and things returned to normal. After yet ANOTHER break I pumped again the other day and got another smaller bump on the topside of my shaft. It is a little hard, and hurts only when you try to squeeze it/pop it. Now any other time I would be worried about an STD. But both myself and my gf are clean and have been checked. I basicly saw it form right after taking the pump off. While Im a little worried about it, because I enjoy pumping, I am confident it will go away. I would just like to know has anyone else experienced this durring or after pumping?