There is such a group of people who love cleanliness and take a bath every day, but the neck, armpits, popliteal fossa (the depression behind the knees) and other parts always look black, and at first glance it looks like "dirty mud" that has not been cleaned in the bath.
However, if you look closely, you can see that the "dirty mud" in those skin folds is melanin and thickened skin tissue.
What's going on here? Could it be that you are infected with some kind of virus like HPV?
Dangdangdang! There is only one truth -
In medicine, this condition is called "acanthosis nigricans", also known as "acanthosis nigricans", which is characterized by the darkening of the skin color, and the thickening and roughening of the skin surface, just like the calluses on the hands of people who often work, but the "calluses" caused by acanthosis nigricans are papillary or velvety, and the color is still "black and black".
Acanthosis nigricans is not a simple skin disease, it can be roughly divided into 8 categories according to different causes:
(1) Benign acanthosis nigricans. The baby is born with the disease, or the child is growing up during puberty, benign, and it will be relieved after puberty.
(2) Malignant acanthosis nigricans. It is not easy to provoke by looking at the name, its onset is often accompanied by visceral cancer, adenocarcinoma, stomach cancer is the most common, the skin damage is more serious, the color is dark, and the symptoms of itching often appear.
(3) Obese acanthosis nigricans. This is the case for many patients, who are overweight and obese, leading to endocrine disruptions and insulin resistance. In short, the insulin in the body "strikes", and the glucose in the blood accumulates more and more, causing metabolic disorders throughout the body. If it is not improved in time, it is easy to cause diabetes, cardiovascular and cerebrovascular diseases, hypertension and other diseases.
(4) Symptomatic acanthosis nigricans. Infants, children, and adults are more likely to develop the disease, but symptoms are milder and often occur with other syndromes.
(5) Acral acanthosis nigricans. It usually occurs on the back of the hand or foot in adults.
(6) Unilateral acanthosis nigricans. Newborn babies or children in childhood or adolescence are prone to the disease, which may resolve naturally over time.
(7) Drug-induced acanthosis nigricans. Caused by taking drugs, such as prednisone and other hormone drugs, it will subside when the drug is stopped~
(8) Mixed acanthosis nigricans. There are multiple symptoms of acanthosis nigricans at the same time.
In general, acanthosis nigricans can be large or small, serious may be related to cancer, diabetes and other diseases, mild may be benign, do not worry too much.
However, it is difficult to distinguish between benign and malignant with our naked eyes alone, and we need to go to the dermatology department of the hospital to see what kind of acanthosis nigricans it is, and then treat the symptoms.
In addition, among the problems closely related to acanthosis nigricans, obesity and diabetes are the most present. If you find that you are overweight, and the back of your neck and armpits are always black, you must pay attention to it, lose weight, run, and lose weight through diet and exercise.
Obese acanthosis nigricans can generally subside on its own as long as you work hard to lose weight~
(Part of the picture comes from the Internet)