White spot on skin - Pityriasis Alba

We stayed n the Philippines for almost a year and came back to AbuDhabi. After few weeks I noticed some white spots on my 3 year old son’s face arms and legs. I went to see a dermatologist however he advised it’s a Pityriasis Alba and given me an ointment for atopic dermatitis. The ointment is a bit expensive and not covered by his insurance. Does anyone experience the same and what sort of home remedy did you do ? Thanks