Small white patches on the skin can be caused by various factors. Sometimes, a small area of skin becomes lighter than the surrounding skin due to irritation or eczema. This is very common in children with allergies, asthma, or eczema. In such cases, doctors usually recommend applying moisturizers to the affected area and avoiding harsh soaps.
Another possible cause of white patches on the skin is a fungal infection called tinea versicolor. This condition can make the skin appear lighter or darker than the normal skin tone. Treatment for tinea versicolor typically involves using antifungal creams.
If the white patches on your skin gradually increase in size or if new patches appear on other parts of your body, you should consult a dermatologist to determine if you have a more serious skin condition, such as psoriasis or vitiligo.