Black hard skin at the toe joints may be caused by prolonged friction, keratotic eczema and other factors.
1. Prolonged friction: If patients wear tight shoes for a long time, this will lead to long time friction of the skin at the joints of the toes, which will lead to local thickening of the stratum corneum, and lead to the activation of the local melanin cells, which will secrete a large number of melanin particles to precipitate in the local area, resulting in the symptom of black skin at the joints of the toes.
2. Keratosis pilaris: when the patient suffers from keratosis pilaris at the toe, it will also cause the symptom of black hard skin at the joints, which is mainly due to the local skin is subjected to chronic inflammation for a long time and repeated stimulation, resulting in local skin hypertrophy caused by itchy, scaly and other symptoms.
When the symptoms of black hard skin at the joints of the toes just appeared, it is recommended to go to the hospital in time, and follow the doctor’s instructions for regular treatment.