Well, those on penis shaft could be sebaceous prominence aka sebaceous cysts. They form around hair follicules, so you may think it is ingrown hair. You should be squeezing it out because you are then more open to infections. If these sebaceous cysts get infected, they may turn into painful, red and swollen cysts.
The tiny little bumps on your scrotum could be folliculitits. They are usually very tiny, raised and contain puss. If they are not going away on its own, then you may need an
antibiotic to take care of it.
It would be best to pay a visit to a urologist or dermatologist (even a GP could take care of the problem) to realize what these bumps are because no one can make
diagnosis according to the symptoms without having a look.
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