Hello, I am very nervous and worried about this. Yesterday, I noticed a small pimple on the bottom right of the shaft. I noticed a white head so decided to pop it and a small amount of pus came out followed by blood. After that a small black scab formed and the area swelled fairly large. The entire thing is red. Today, the swelling is still there and the scab is black and painful. The area keeps running against my pants at work making it very painful. Please help I am very worried.