This is a change? Could always get it looked at by your doc. Sometimes things are just normal or maybe you are a little irritated for a variety of reasons. The bump has been there how long? Just gonna ask, do you think it is a wart? Are you having sex where you could have gotten HPV? Here's a bunch of things that would be bumps on the penis head to look through and see if any sound like you. https://www.healthline.com/health/bumps-on-head-of-penis#causes. But did you know this could really just be a pimple? It happens.