Sudden growth of small black spots on the skin may be caused by factors such as hyperpigmentation, keratosis pilaris, blackheads and acne.
1. Hyperpigmentation: If you are exposed to ultraviolet radiation for a long time, it will lead to the proliferation of local melanocytes and secretion of a large number of melanin particles, which will precipitate locally in the skin and make the patient suddenly grow small black spots on the skin.
2. Perifollicular keratosis: this disease is related to genetics, vitamin A, metabolic disorders, endocrine factors, etc., which will make the skin dry, keratinization abnormalities, follicular papules, so that the skin suddenly grows small black dots on the situation.
3. Blackheads and acne: If the skin is usually not cleaned properly, it will cause sebum to mix with keratinized debris, which will lead to clogging of hair follicles and follicular orifices and the sudden growth of small black spots on the skin.
There may be other reasons for the sudden growth of small black spots on the skin, so you need to go to the hospital to improve the examination and give targeted treatment.