White patches on the stomach may be caused by diseases such as pityriasis alba, vitiligo, florid chaff rash, etc., which can be treated by applying medication as well as surgery. 1. Leucoderma: patients with dry skin or often exposed to sunlight easily lead to skin moisturizing ability to reduce, will cause patients with white patches of skin. It can go away on its own and generally does not need treatment. You can use moisturizing cream to keep the skin moist. 2. Vitiligo: Vitiligo is usually caused by the destruction of melanocytes in the body, melanin production will be reduced, thus causing the patient’s skin to appear white. You can apply halometasone cream, tacrolimus ointment, carbostanol ointment and other drugs for treatment. For patients with serious condition, skin transplantation can be carried out. 3. Mottled furuncle: Mottled furuncle is usually caused by Malassezia infection, which is easy to invade the skin stratum corneum of the patient, thus causing skin lesions, accompanied by white patches. It can be treated by applying drugs such as compound ketoconazole ointment and tretinoin econazole cream under doctor’s guidance. Psoriasis can also appear as white patches on the stomach, and requires prompt medical treatment, after the cause of the disease is clarified to treat the cause. All of the above medications should be used under the guidance of a doctor.