Melanin deposits on the back are related to post-inflammatory hyperpigmentation, neurodermatitis, amyloidosis, acanthosis nigricans and other factors.
1. Post-inflammatory hyperpigmentation: If the patient has eczema on his back, he may scratch for a long time because of itching, and after the symptoms of eczema get better, post-inflammatory hyperpigmentation will be formed, which will be manifested as melanin precipitation.
2. Neurodermatitis: associated with mental emotions, scratching and friction and other factors, there will be a single or multiple flat papules fusion of the skin mossy changes, accompanied by intense itching, can also lead to melanin deposits on the back.
3. Cutaneous amyloidosis: the phenomenon of hyperpigmentation on the back is not excluded and cutaneous amyloidosis and other factors related to long-term friction, viral infection, environmental factors.
4. Acanthosis nigricans: it is related to heredity, endocrine disorders, obesity and so on, which can also lead to melanin precipitation on the back.
Patients can go to the dermatology department of the hospital, need to cooperate with the doctor to improve the relevant examination, and then do the treatment after the cause is clear.