Pigmented prurigo
Introduction
Introduction to pigmented pruritus The disease is a rare pruritic inflammatory skin disease, first reported by Nagashima et al in 1971, the cause is unknown. Pigmented pruritus is most commonly affected by young women, mostly in spring and summer, and is extremely rare in cold seasons. Its clinical features are sudden onset, severe itching, recurrent and progressive, and the duration of the disease lasts for 6 months to more than 8 years. basic knowledge The proportion of illness: 0.001% Susceptible people: no special people Mode of infection: non-infectious Complications: drug eruption adult pruritus
Cause
Cause of pigmented pruritus
At present, the cause of pigmented pruritus is still unexplored. One believes that there are two types: one is environmental factors, mechanical trauma and clothing friction are the main reasons; the other is related to contact or some chemical substances in food, such as contact. Trichlorophenol, which ingests bismuth subsalicylate, causes an allergic reaction in the body, which is characterized by pigmented pruritus.
Prevention
Pigmented pruritus prevention
Should try to find the cause and cure it. Prevent insect bites, should be corrected for gastrointestinal disorders such as diarrhea and constipation, and those with lesions should be treated. Pay attention to improving nutrition and hygiene.
Complication
Pigmented pruritus complications Complications, drug eruption, adult pruritus
Due to long-term friction and scratching, bleeding and blood stasis occur, the most important being pigmentation and pruritus.
Symptom
Pigmented pruritus symptoms common symptoms scaly papules reticular pigmentation spots
The rash is characteristic: the initial lesion is a pruritic papule that can be fused into a squamous or wheal-like and eczema-like change with scaly, mild erosion, or a small number of blisters and herpes-like changes, papules. After a few days, it naturally subsides, leaving no itch-like reticular or plaque pigmentation, and rash can appear repeatedly in the pigmentation site, pigmentation is also deepening and prominent, and gradually has a unique marble-like appearance. The lesions are symmetrically distributed, mainly in the upper back, neck and back, clavicle and chest and back. They can also occur in the upper arm, elbow fossa and waist. The skin between the skin lesions is normal, and there is usually no change in mossy appearance. Good, very few special complications occur.
Young women have more onset, the damage is mainly seen in the upper back, neck, clavicle and chest, and the upper arm and trunk are occasionally seen in the forehead and cheek. It is a pruritic reddish papule that can be fused or whipped and eczema-like, with a symmetric distribution. After the rash subsides, there is no itch-like plaque or plaque pigmentation. If the rash is recurrent, it is mainly limited to the pigmentation area. The condition can be delayed for several years.
Examine
Examination of pigmented pruritus
Mainly for pathological biopsy and blood examination, eosinophils in peripheral blood increased.
Diagnosis
Diagnosis and diagnosis of pigmented pruritus
According to the number of young women, there are characteristic clinical symptoms and predilection sites, combined with pathology showing a lichen-like tissue reaction, which can be diagnosed. However, it needs to be identified with the following diseases.
(A) vascular atrophic cutaneous heterochromia This disease has three characteristic manifestations, namely reticular pigmentation, skin atrophy and vasodilation, can be identified.
(B) the fusion of reticular papillomatosis occurs in the chest, the skin lesions are pigmented warts or papilloma-like papules.
(C) The melanosis pruritus is described by Pieriui and Borda. This disease occurs mostly in middle-aged women. The skin lesions are pruritic papules and reticular pigmentation, which occur mostly in the trunk and are associated with primary biliary cirrhosis.
