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The symptoms you have described of having pimple like bump on your penis shaft can be most likely due to folliculitis.It is inflammation of one or more hair follicles.The damaged follicles are then infected with the bacteria staphylococcus.
Less likely possibility is of fordyce's spot. They are painless and not itchy, but may cause embarrassment because of their appearance, or a fear that they might be sexually transmitted – which they are not! They are abnormally dilated blood vessels, covered by thickened skin.
Most likely this seems to be due to folliculitis & following is recommended for you:
If still after this,the symptoms persists.then you need to make an appointment with your doctor as prescription oral medications and antibiotics will then be required accordingly.Usually & most likely,the symptoms gets subside with these treatments.
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