Thanks for your query.
I understand your concern.
could be allergic or infective in nature.
Since there are no associated symptoms no need to worry.
lotion 2 to 3 times a day.
as per dosage.
Keep a close eye on progression of rash and if it persist even after 24 hours or any new symptom appear get him evaluated by pediatrician
as physical examination of rash will be needed.
Wishing your child good health.