First of all thank you mom for your answers!
It seems to be a simple irritation caused by moisture and rubbing in the diaper. It is possible for you to try applying at least 20% zinc cream at each diaper change using disposable diapers for the duration of the zinc cream use. You can clean the area with a wet cloth or wipes but it is not necessary to remove the cream completely if there is no stool. Also be sure to dry the area well before applying the cream. You can change the diapers more often for the next 2-3 days or leave it out for a period of time without a diaper if that is possible for you.
The important thing is not to use scented soap, antiseptic, or pull on the foreskin to reach the skin underneath.
If after 3-4 days of treatment the redness has not diminished, if it spreads to other areas or if symptoms of infection such as fever or pain appear, it will be best to consult a doctor. He or she will then be able to diagnose the presence of an infection and prescribe the appropriate treatment.
If you use a product like liniment or even a balm like Baby Owl don't hesitate to put some on his scrotum and penis as well when the redness tries to come back or just in maintenance. Liniment is a pretty handy solution since it cleans the area while leaving a thin protective layer.
Hopefully this helps, if you ever have any other questions, feel free to write me again. Have a great evening! 🙂
Andrée-Ann P. pharmacy student under the supervision of Alexandre Chagnon, pharmacist