Pigmentation in young children

We first thought it was white spots, according to the GP, the blotchiness is caused by Celeste's sensitive nose. After confirmation from the Pediatrician, its actually pigmentation caused by the sun. I guess it happened over the period of time when she walked home everyday from school in the hot sun. Guess the UV rays was too strong for the young child even though she was wearing a hat. I read from an article that outdoorsy children who are often exposed to the sun can also develop a skin condition called Pityriasis Alba, which causes white scaly patches on the cheeks. To protect their skin, parents should apply sunblock on them or give them shade.