pityriasis asbestos
Introduction
Introduction to asbestos-like pityriasis Asbestos-like pityriasis (pityriasisamiantacea) has been called asbestos-like sputum. The thick sputum accumulated in the head scales resembles asbestos-like and non-fungal infections. Therefore, the name of asbestos-like pityriasis should be used. The damage is characterized by scaly lesions similar to asbestos-like accumulation on the scalp. This disease occurs in adolescents and is a chronic disease. This disease is similar to the "white wind" recorded in the medical literature of the motherland. basic knowledge Sickness ratio: 0.05% Susceptible people: no special people Mode of infection: non-infectious Complications: pruritus
Cause
Asbestos-like pityriasis
Bacterial infection (10%)
Bacterial infection is an acute systemic infection caused by pathogenic bacteria or conditional pathogens that invade the blood circulation and produce toxins and other metabolites. Some people think that asbestos-like pityriasis may be a special reaction caused by bacterial infection of the scalp.
Trauma (20%)
The scalp hair follicle keratinization is caused by the damage caused by the impact of external objects, collision or chemical attack. The keratin of the hair follicle is clinically proliferated. The proliferating keratin becomes the sheath with the hair moving upward, and the scaly scale is formed after falling off. .
Secondary disease (40%)
Asbestos-like pityriasis can also be secondary to psoriasis, seborrheic dermatitis or streptococcal infection.
Prevention
Asbestos-like pityriasis prevention
There are no effective preventive measures for this disease, and attention should be paid to prevent bacterial infection and trauma in life; patients with psoriasis and seborrheic dermatitis should be diagnosed early and diagnosed early to prevent the development of this disease.
Complication
Asbestos-like pityriasis complications Complications pruritus
Hair is not intrinsic and may have mild itching.
Symptom
Asbestos-like pityriasis symptoms common symptoms scaly hair loss
Occurs in children and young adults, the damage can be limited to part of the scalp, but more commonly diffuse all scalp, and even extend to the neck, showing thick whitish scales on the scalp, overlapping like a roof tile, like asbestos, sticking to the scalp The hair is bundled by thick scaly, the hair itself is not invaded, and there is a temporary hair loss between them. The base is generally free of inflammation. If it is wet, exudate or secondary infection, it may show mild flushing. And the smell is unpleasant, the disease is slow, often lasts for many years, and the prognosis is good.
Examine
Asbestos-like pityriasis
(1) Routine examination: examination of hair sheath, squamous scales and hairy sacral bulge:
Hair sheath
Examination revealed that the proximal end of the hair had a pure white sheath resembling asbestos crystals, and the hair shaft was used as the central axis to move up and down. The sheath turns grayish or grayish yellow over time or due to the adhesion of dirt, and gradually loses asbestos-like color.
2. scaly scales
The white scaly scales accumulate, stick to the roots of the hair and the scalp to form a large thick sputum, and forcefully peel off the scaly pieces of the visible layer. There was no abnormal change in the hair and scalp in the thick white sputum.
3. Hair follicle spine bulge
Asbestos-like, pure white, tightly wrapped around the roots of the hair.
(B) histopathological examination: horny hyperplasia of the hair follicle mouth, sometimes visible sebaceous gland degeneration.
Diagnosis
Diagnosis and identification of asbestos-like pityriasis
diagnosis
According to the characteristics of skin lesions, the predilection site and prognosis are not difficult to diagnose.
Differential diagnosis
1. Psoriasis: The basal inflammatory infiltration is more obvious, and the body often proves to have psoriasis damage, which can be relieved with the seasons.
2. Seborrheic dermatitis: The inflammation is more obvious, it is easy to secondary to eczema, and often it is extended to the face and itching is remarkable.
3. White peony: Early damage may have papules, vesicles, thin scales, broken hair, white fungus sheath in the lower part of the hair shaft, positive pathogenic fungi, filtered UV light, showing bright green fluorescence.
