Thank you for your query.
It is good that the allergic rash
has disappeared but the nappy rash and the mucus like pale discharge is disturbing you. I suggest that you apply some bland ointment or oil in the nappy area and leave it open as much as possible. This should control the nappy rash. In case the nappy rash persists then a mild steroid
ointment would have to be used.
If the mucus like pale discharge again appears then an examination by a doctor would be advisable to know the exact cause.
I hope I have answered your query to your satisfaction.
Wishing your son all the best.