White spots on the arms are mostly considered to be caused by anemic nevus, white furfura and vitiligo.
1. Anemic nevus: Anemic nevus is a disease caused by congenital vascular function abnormality, blood vessels are in a state of contraction, making the skin white. It will show single or multiple clear border, but irregular pale white spots, which can be round, oval and linear.
2. White furfury: the cause of white furfury is still unclear, may be related to atopic dermatitis, ultraviolet radiation and other factors. The skin lesions are round or oval, with unclear borders and mild pigmentation loss, covered with dry, fine bran-like white flakes. 20% of patients will be distributed in the neck, forearms and shoulder blades and other parts.
3. Vitiligo: Vitiligo is a common pigment loss skin disease, patients with the initial skin color becomes lighter and lighter, with the continuous development of the disease, the local skin will be completely white and the surrounding normal skin has a clear demarcation.
If the patient has white spots on the arm, you should go to the local hospital in time, as soon as possible to find the problem as soon as possible treatment.