persistent erythema
Introduction
Introduction to persistent pigmented erythema The erythemayschromic erythema (erythemadyschromicumperstants), also known as ashydermatosis, is a skin disease characterized by the slow extension of the active erythema to the periphery and the presence of gray pigmentation in the center. basic knowledge The proportion of illness: the incidence rate is about 0.0005% - 0.0007% Susceptible people: no specific people Mode of infection: non-infectious Complications: foreskin balanitis
Cause
Persistent pigmental abnormal erythema
(1) Causes of the disease
May be a multi-effect skin allergic reaction, some people think that it is related to sun exposure, insect bites, intestinal parasites, autoimmune diseases, this disease may also be related to pigmented lichen planus, Riehl melanosis.
(two) pathogenesis
The cause is unknown, the pathogenesis is unclear, and may be a multi-effect skin allergic reaction.
Prevention
Persistent pigmental erythema prevention
There is no effective preventive measure for this disease. Early detection and early diagnosis are the key to the prevention and treatment of this disease.
Complication
Persistent pigmented erythema erythema Complications, foreskin balanitis
1) Foreskin balanitis: often occurs in a certain degree of foreskin is too long, can be caused by a variety of different reasons, such as smegma and local physical factors, various infectious factors, such as foreskin and glans redness, erosion, patients No history of drug allergy.
(2) hard sputum: for the first-stage syphilis damage, manifested as erosive papules of the external genital tract, with serous exudation, the surface is flat and clean, the edge is slightly higher, the number is one or two, no pain, easy to self-heal . Treponema pallidum was positive.
Symptom
Persistent pigmental abnormal erythema symptoms Common symptoms Red pigmentation abnormal erythema (border clear...
It can occur at any age, but it is mostly young and middle-aged. There is no difference in gender. It is scattered on the face, trunk and limbs. Except for the scalp, palmar and mucous membranes, other skins can be involved. The skin lesions are mostly gray erythema, and the size is not. Etc., the realm is clear, the fusion can be expanded, and the erythema color becomes light gray afterwards. During the active period of the lesion, the edge of the erythema is slightly raised or the edge of the original pigmentation spot is surrounded by a blush, and there is a slight infiltration, which is telecentrically enlarged and forms a ring. , multi-ring or irregular (Figure 1).
1. It can occur at any age, but it is mostly young and young, and there is no difference in gender.
2. Scattered in the face, trunk and limbs, except for the scalp, palmar and mucous membranes, other skin can be involved.
3. The skin lesions are mostly gray erythema, the size is different, the boundary is clear, and the fusion can be expanded. After the erythema color becomes light gray, the lesions are active, the edge of the erythema is slightly raised or the edge of the original pigmentation spot is surrounded by red. It has mild infiltration and is telecentrically enlarged, forming a ring shape, multiple rings or irregular shapes (Fig. 1).
4. Slow development, the red edge of the activity often subsides within weeks or months, leaving pigmentation, sometimes with both pigmentation and hypopigmentation in the same lesion area, usually without symptoms or itching during the period .
Examine
Persistent pigmented erythema
Histopathology: epidermal sponge formation, or even micro-blister formation, basal cell edema degeneration and pigment incontinence, visible hyperkeratosis of scattered hair follicles, lymphocytes around the upper dermis, tissue cells and numerous phagocytic cells, only melanocytes in the late stage Abnormal aggregation.
Diagnosis
Diagnosis and identification of persistent pigmented erythema
It needs to be differentiated from chloasma, Riehl melanosis, fixed drug eruption, and ring-shaped atrophic lichen planus.
