Small black spots on the arms belong to the color spots on the exposed parts of the upper limbs, and the most common ones are age spots, sun spots and so on.
1. Age spots: some patients may have symptoms of age spots due to genetic susceptibility and skin aging, especially when they are exposed to the sun for a long period of time, resulting in the symptoms of small dark spots on arms.
2. Sun spots: prolonged exposure to sunlight, ultraviolet rays in sunlight will activate the function of local melanocytes and release inflammatory cytokines, which will enhance the activity of tyrosinase in melanocytes, which will promote the synthesis of melanin, thus causing the symptoms of small dark spots on the arms.
The appearance of small black spots on the upper limbs may also be related to nevus melanoma, black degeneration disease and other diseases, you can go to the regular hospital for consultation, after a clear diagnosis, give targeted treatment.