Although the picture isn't very clear. The white dry patches on face are most likely to be pityriasis alba. Which could be a part of atopy as well.
Kindly consult a dermatologist near you for appropriate treatment.
Next Steps
Good ceramide based moisturiser for face and body.
Healthy diet.
Deworming.
Health Tips
For dry skin--Pls apply virgin coconut oil 15-20 min prior to bath and then give bath with warm water and mild soap.