pityriasis simplex
Introduction
Introduction to simple pityriasis Pityriasissimples, a chronic skin disease characterized by superficial dry scaly hypopigmentation that occurs in the face, with mild or absent inflammation, mainly invading children, occurring in the face, or involving the torso Limbs. The onset season is more common in spring, but also in early summer and winter. The disease is quite common and the symptoms are mild. basic knowledge The proportion of sickness: 0.01% Susceptible people: children Mode of infection: non-infectious Complications: white spots on the skin
Cause
Simple pity origin
Malnutrition (30%):
Malnutrition in a broad sense should include both undernutrition or deficiency and overnutrition, and the present is only discussed. Malnutrition often occurs in a number of medical and surgical causes, such as chronic diarrhea, short bowel syndrome, and malabsorption.
Vitamin deficiency (30%):
Vitamins are a healthy element in each of us. In the absence of vitamins in the human body, the corresponding metabolic reactions will cause problems, resulting in vitamin deficiency. Lack of vitamins will make our body's metabolism unbalanced, immunity will decline, and various diseases and viruses will come into being.
Sun exposure (20%):
In the spring, the sun is enhanced, people's outdoor activities increase, and the skin is dry or some people with certain physique can suffer from the disease.
Pathogenesis
The pathogenesis is unclear. At present, it is considered that non-specific dermatitis, malnutrition or vitamin deficiency, dry skin, and sun exposure can cause this disease.
Chinese medicine believes that the wind is hot and stagnation of the lungs, with the rise of the yin, or by the diet, the insects endogenous, the spleen loses health, and the disease.
Prevention
Simple pityriasis prevention
Keep your face clean. Do not wash your face with too much alkaline soap. For dry skin, apply a moisturizing cream to avoid excessive exposure. Wear a sun hat or sunscreen as much as possible to enhance nutrition and vitamin supplement. Pay attention to labor protection. Do a good job in labor protection and reduce direct contact with chemical raw materials, paints and heavy metals and harmful substances.
Complication
Simple pityriasis Complications, skin white spots
Simple pityriasis often occurs in exposed areas such as friction and sun exposure; especially on the face (such as the eyebrows, the inside of the eyebrows, the joints of the nasal roots and the cheeks, the front and the upper part of the ear, and the forehead hairline And the red part of the lips, the neck, the waist and abdomen (the waist), the extension of the forearm of the appendix and the back of the finger. Typical white spots are mostly nails to coins, nearly round and elliptical. Although they are enlarged or merged into irregular large shapes in the future, no matter how their shape changes, the edges of white spots are always visible, and island-like pigments are added to white spots. Point; another typical white spot is a banded or strip-shaped depigmented spot distributed along the nerve, and the edge of the white spot is neatly cut like a knife.
Symptom
Simple pityriasis symptoms Common symptoms Lip round or oval erythema scales frontal leukoplakia
Skin lesions are one or several round or oval, coin-sized patches, lighter than normal surrounding skin, pale, with a dry surface, with a small amount of finely divided gray scales, mild or lacking basal inflammation, and the damage can gradually Enlargement, neighbors can be integrated with each other, consciously itchy or no symptoms, skin lesions occur in the face, especially on the cheeks and forehead, but also in the neck, trunk and limbs, the damage can naturally disappear, leaving light pigment Decreased, the course of the disease is slow, several months or even one year, after the scales have subsided, the white spots have continued for more than a year. The disease is more common in children or adolescents, and occurs more in spring, and can also be seen in early summer and winter.
Examine
Simple pityriasis check
1. Even invading the neck, shoulders, trunk, buttocks and upper part of the thigh, the diseased part is mostly on the face. The site of the disease is symmetrical. From the beginning, it is a circular or elliptical shape with different sizes. The red erythema is not obvious around. After 12 weeks, the red gradually fades and becomes a light stain. The appearance is dry and overlaid. A small amount of grayish white scaly scales, light spots are often different for a number of 14cm in diameter. Generally, there are no symptoms, and sometimes it feels mild itching.
2. Histopathology: mild edema, acanthosis hypertrophy, moderate hyperkeratosis and patchy keratosis, decreased melanin.
Diagnosis
Simple diagnosis of pityriasis
diagnosis
More common in pre-school males, female children, good for the face, but also on the trunk and limbs; skin lesions of one or several pieces, unclear white or red patches, a small amount of scaly scales, skin After the loss subsided, the residual white pigmentation was reduced; there was no symptom; some scaly scaly microscopy could find P. ovale.
There are two kinds of diseases that need to be identified with this disease: one is vitiligo, the white spots are obvious, the surface is smooth and no scales, the surrounding skin pigments tend to deepen, there is no certain good hair parts; the second is body sputum, there are ring-shaped inflammatory edges, scraping scales The fungus can be diagnosed.
Differential diagnosis
The disease should be differentiated from vitiligo and tinea versicolor.
Vitiligo: It appears as a pure white patch, and even the middle hair can be white, the edges are clear, and the dark pigmentation is surrounded by a circle with a smooth surface and no scale covering. The disease is pale white or reddish patches, the hair does not change color, the edges are free of pigmentation, and the patches are covered with fine scales.
Pityriasis versicolor: There are many hyphae and spores in the stratum corneum, and PAS staining can clearly show.
