Dark spots on the arms may be caused by sun spots, seborrheic keratosis, perifollicular keratosis and other causes of melanin deposition appearing dark spots.
1. Sun spots: brownish-black spots may appear on the arms if they are exposed to ultraviolet rays in summer.
2. Seborrheic keratosis: It means that the exposed parts of the face and the back of the hands have brown spots from rice grains to nail cap, with clear boundaries, and some of them have seborrheic scabs on the surface and hyperkeratosis, which belongs to senile skin changes. Different people seborrheic keratosis occurs in different ages and situations, but generally does not affect the health of the organism, only in the exposed position of the skin to affect the aesthetics.
3. Perifollicular keratosis: It is a hereditary skin disease with abnormal keratinization process caused by autosomal dominant inheritance. Generally, vitamin A metabolism disorder and sun exposure are important causative factors. The condition of pinpoint black spots on the arms can also occur.
Black spots on the arm may also have other causes, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.