Thank you for your query on Healthcare Magic.
The white spots
at the base of his penis may be resulted from bacterial skin infections like pustules or pyoderma
And fungal infections like candida dermatitis
is a common thing to occur in these regions because of excessive moisture presence and due to irritation with the diapers.
Physical examination by your Pediatrician
is important to diagnose the skin problem and the treatment depends on the clinical diagnosis.
Keep the area clean and dry.
I advise you to consult the doctor for physical examination and treatment.
Hope I have answered your query.