Small white round spots on the skin, first of all, we should consider whether the skin has been stimulated by outside, such as sunburn, trauma, chemical burns, long-term skin contact with rubber products or plastics, etc., which may lead to local skin hypopigmentation and the appearance of small white round spots. Secondly, if the local skin had lesions and inflammation, when the inflammation subsides, it will also cause pigmentation and appear white small round spots. The above causes usually do not require special treatment and can fade away on their own. In addition, other pathological causes can also lead to the appearance of white spots, which need timely treatment. Common causes and treatments 1, lichen planus: commonly known as sweat spots, is a superficial skin infection mainly caused by Malassezia, mostly occurs in the trunk, upper arms, neck, armpits and other parts, symmetrical distribution. The rash may appear as purple, tan, pink, white or brown patches; it may appear as small white circular patches, 4-5 mm in diameter or larger, without scales initially, with scales produced by scratching. There are usually no self-conscious symptoms, and there may be a slight itching sensation, which tends to appear in summer. Topical medication is the main treatment, commonly used antifungal drugs, such as sodium thiosulfate solution, ketoconazole, etc. Can also take oral medication, such as ketoconazole, itraconazole, etc.; 2, simple pityriasis: also known as white pityriasis, commonly found in children or adolescents facial skin, as well as the upper arm, neck and shoulder, belongs to the non-specific inflammatory skin disease. Dry skin, sun exposure, vitamin deficiency, etc. can induce this disease. It occurs in spring and subsides in summer and autumn. The rash is a hypopigmented round or oval patch, white or light red, with clear borders, varying sizes and a dry surface. The cause is still unclear, clinically considered may be related to genetics, mental factors, immunity and endocrine metabolism. It occurs at any age and on any part of the body. It is characterized by depigmented white patches of variable color and shape, and the skin appears as small white circular patches. There are no conscious symptoms, but itching is usually a sign of progressive disease. Clinically, there is no special treatment method, and steroids are generally used for treatment, orally or locally applied; photochemotherapy or phototherapy can also be used to eliminate the white spots; for patients with stable disease and white spots that are not generalized, clinical autologous epidermal transplantation can also be performed; 4, senile leukoplakia: with ageing, skin aging, melanocyte reduction, senile leukoplakia can be formed, mostly seen in middle-aged and elderly people, mainly It is mainly distributed in the chest, back, limbs and other parts. The local skin is shown as round white spots with the size of rice grains to green beans, which can be slightly depressed, without conscious symptoms, and usually without treatment. Note for patients with small white round spots on the skin, you can promptly consult a doctor to determine the cause of the disease. At the same time, the treatment process pay attention to the medication in accordance with medical advice, avoid prolonged sun exposure.