Can Men Get Pimples Or Blackheads On Penile Shaft?

My son is 9 years old. He showed me his pens and said he had a little bump on it. When I looked At it, it looked like a clogged pore. I carefully squeezed it and white thick substance oozed out , like When you squeeze a blackhead. I carefully cleaned it and applied a small amount of neosporin. Can males get pimples or blackheads on the shift of their penis.? ,