A small, dark, hard grain on the skin may be caused by acne, moles, acanthosis nigricans, sebaceous cysts and other diseases.
1. Acne: The cause of acne is mainly related to the increased secretion of androgen levels, and the main symptoms of patients are whiteheads, blackheads, pimples, pustules, etc. In addition, acne can also lead to nodules and cysts. In addition, acne can also lead to nodules and cysts.
2. Nevus: The cause of nevus is unknown, and it is considered to be caused by congenital heredity, developmental defects and other factors. Moles can be black or brown in color, and can be itchy or painful.
3. Acanthosis nigricans: the cause of acanthosis nigricans is not yet clear, and it is considered to be caused by heredity, obesity and other factors. Patients mainly show black wart-like skin cells, darkened skin color, roughness, dryness and other symptoms, as well as hyperkeratosis, itchy skin and other symptoms.
4. Sebaceous cysts: sebaceous cysts are caused by the blockage of the sebaceous glands of the hair follicles, and the main symptoms of the patients are cysts of the size of a grain of rice, black indentation in the center, and other symptoms such as redness, swelling, fluctuation, pain, etc. The patients have black, hard skin, and the skin has become darker, rough and dry.
When the patient has the phenomenon of a small black hard grain on the skin, he can go to the hospital for examination and follow the doctor’s instructions after clarifying the cause of the disease.