White patches on the arms may be caused by trauma, lichen planus, vitiligo, anemic nevi and other factors.
1. trauma: for example, cutting injury, resulting in localized skin damage to the arm, after the healing of the skin injury site, it will make the local presence of white patches, there are no other clinical symptoms, and do not need special treatment.
2. lichen planus: may be related to fungal infection, environmental factors, genetic factors, can lead to arm localized yellowish or white patches, accompanied by itching, peeling and other symptoms.
3. Vitiligo: it may be related to heredity, skin injury, autoimmune diseases and other factors, resulting in white patches on the arms or other body parts, the area may gradually increase.
4. Anemic nevus: may be related to genetic factors, can lead to the patient’s limbs parts of the light white patches, usually distribution of dense patches, arranged in the shape of blades, light white color.
If there are white patches on the arms, and accompanied by other abnormal symptoms, it is recommended to go to the dermatology department of the hospital in time for diagnosis and treatment.