My son is now 6 weeks. My son now has a mark on his testicle. About the size of a thumb print. Looks like he was pinched but he has not. Its not painful to him and I'm positive its not diaper rash. More of a light bruise. Anyone have experience with this or much know what it is? I'm a ftm. I know strange things happen to babies due to our hormones leaving their body. Could this be one of them. Because its not causing him pain I'm going to watch it for a day or two. If it gets worst I plan to call the Dr. I know you guys are not drs and they are the best route but maybe its normal? I am very clueless about boys. For example I thought boys didnt get their first erection until puberty. Well I was surprised during a diaper change one day. Haha.