18 months baby hand back long small white spots, may be white furfura, vitiligo and other causes, different causes of treatment is not the same, can be through the topical and oral medication. 1. white chaff rash: white chaff rash may be related to vitamin deficiency and sun exposure and other factors, manifested as a rounded hypopigmented spots, the surface of fine bran-like scales. It can be cured naturally, pay attention to sun protection, balanced nutrition. The topical emollient cream such as urea ointment, vitamin E ointment, etc. can be used. 2. Vitiligo: Vitiligo may be related to genetic, autoimmune system diseases and other factors, manifested as white spots, any part of the occurrence, the treatment according to the staging, typing and the area of the choice of treatment methods. For 18 months baby can be local topical mometasone furoate cream and so on. If necessary, oral glucocorticoid can be taken, with phototherapy and so on. The above drugs are recommended to be used under the guidance of a doctor. 18 months old baby hand back long small white spots, it is recommended to go to the hospital in time to improve the examination, to clarify the cause of the disease to give targeted treatment.