friction melanosis
Introduction
Introduction to rubbing black disease Frictionmelanosis is a reticular hyperpigmentation of local skin caused by long-term repeated mechanical stimulation. basic knowledge The proportion of illness: 0.03% Susceptible people: young women who are good at losing weight Mode of infection: non-infectious Complications: depression
Cause
Rubbing melanosis
(1) Causes of the disease
According to the morphology of the lesions, the specific predilection sites and the investigation of the pathogenic factors, it is basically confirmed that the disease is caused by external local irritation. The most striking stimulants are nylon, rayon and cotton. Health towel, which is widely used in Japan, is often used by users when bathing to strongly rub the skin for healthy skin.
(two) pathogenesis
Due to the repeated friction and compression, the subcutaneous fat of the skin close to the bone surface is scarce, and it is easy to damage the basal layer of melanocytes in the epidermis.
Prevention
Friction black disease prevention
Early detection and early diagnosis and early treatment.
Complication
Rubbing black complication Complications depression
The disease is mainly caused by skin pigment residue, so it mainly affects the appearance of the skin. Clinically, it is generally not complicated by friction and blackness and other diseases. However, for patients with excessive stress and depression, especially in adolescence, beauty can be affected by skin pigmentation, so it can induce depression, and patients with similar tendencies should pay attention to it.
Symptom
Rubbing melanosis symptoms common symptoms itch pigment abnormal pigment spots
Abnormal skin pigmentation, mainly from pale brown to dark brown banded or plaque pigmentation, diffuse, smooth surface without papules, scaly and keratinization tendency, pigmentation is evident at the edge of pigmented plaque and consistent with dermis, and hair follicle The mouth and the furrow do not occur. The pigmented spots are finely meshed, and the boundary is mostly clear. The shape is roughly the same as the shape of the skin on the affected part. It is often confined to the clavicle, rib arch, shoulder blade, spine and anterior. Elbows, knees and other bone bulges, a small number of patients can also affect the upper back, neck, waist, abdomen and other non-bone ridges, the latter edge is more blurred, the tone is lighter.
The disease occurs in young women with body weight loss, not seen in obese people, males are rare, and the main symptoms are not itching or itching is mild.
Examine
Rubbing blackening disease check
Histopathology: The basal layer of the epidermis and the spinous layer of melanin granules increased, and the dermis changes were characterized by pigment incontinence. Most of the dermal layers were found in the dermal layer, especially in the dermal layer. No amyloid deposits were found in the specially stained dermis.
Diagnosis
Diagnosis and identification of rubbing black disease
According to the population, the history of the disease, the damage characteristics and distribution characteristics and the pathological changes, the disease is easy to diagnose.
The confusing diseases are mainly amyloidosis of plaque skin. The latter is common in middle-aged women with itching. The lesions are common on the upper back and are symmetrically distributed reticular pigmentation spots. At first glance, the two diseases are similar, but carefully observed. Pigment plaque, which consists of a small papule with punctate pigmentation, showing a "corrugated" appearance. Histopathology indicates that the dermal papilla layer is characterized by amyloid deposition, and there may be a A causal relationship between each other needs to be studied in depth.
