What Causes Ingrown Hair On Bottom Of Penis Shaft Along With Pus Pockets?

Hi, I think I have an ingrowing hair on the bottom of my penis shaft which appeared about a week and a half ago. I did initially try to squeeze it. It has now become very painful with numerous pus filled spots in it and the left side of my groin area has become swollen and painful and my testicles have also become swollen but not painful. I wondered if it could have become infected? Thanks.