Thank you for your query on Healthcare Magic.
Fungal infections like candida (yeast) will present like red spots in the genital region due to increased moisture and less aeration.
But physical examination of the pattern of rash
is important to know whether it is a fungal, or allergic ,or a contact dermatitis
What I advise you is to consult your Pediatrician
for the examination of rash and for appropriate treatment.
Without a prescription don't use any medication for the rash as it may aggravate the problem some times.
Hope I have answered your query.