White spots on the cheeks are very common and usually harmless. They are often caused by pityriasis alba (a mild, dry-skin related eczema), a superficial fungal infection like tinea versicolor, or post-inflammatory hypopigmentation. To treat pityriasis alba, focus on keeping the skin hydrated using a gentle, fragrance-free moisturizer and applying a mild, over-the-counter hydrocortisone cream (0.5% to 1%) for a short period. Applying broad-spectrum sunscreen daily is also highly recommended to prevent the surrounding skin from tanning, which makes the spots more visible. If fungal, a topical antifungal like clotrimazole may be used. I recommend visiting a doctor for a precise diagnosis.