Infectious eczematous dermatitis
Introduction
Introduction to infectious eczema-like dermatitis DermatitisEczematoides Infectiosa is a localized acute eczema-like dermatitis that occurs on the basis of infectious lesions. It spreads to the vicinity and often forms a piece of oozing and scarring. It can also be dried and desquamation. It is an eczema-like dermatitis that is secondary to chronic infection sources, skin purulent sources, and traumatic infections. The bacterial culture in the source is more positive, mainly Staphylococcus. Common causes are trauma, otitis media, skin infections, hemorrhoids and so on. Before the onset of the disease, the affected part is often treated improperly, the drainage is not smooth, etc., and the symptoms such as blister and exudate are aggravated in the local area, and the cost is increased to the surrounding area. basic knowledge The proportion of illness: 0.001% Susceptible people: no specific people Mode of infection: contact spread Complications: pruritus
Cause
Causes of infectious eczema-like dermatitis
Self-sensitive (26%):
The patient has a local staphylococcal infection, and the disease spreads to the vicinity of the infected lesion, which is not only a self-inoculation process, but also an auto-sensitive manifestation.
Infection (30%):
Infected lesions can be divided into otitis media, sputum, sputum, eye, ear or vaginal secretions, traumatic infections, as well as chronic ulcers and burn infections. The nearby skin can be allergic to bacteria or other products or damaged tissues of the exudate. The reaction then causes eczema-like dermatitis.
Pathogenesis
Suppurative lesions, such as otitis media, impetigo or traumatic infections, of bacteria or tissue chemicals in the purulent effusion as antigens, sensitizing to the skin, and eczema-like dermatitis changes, studies have shown that bacterial antigens can promote The cytotoxic reaction in the skin may aggravate or promote the persistence of eczema-like changes, but it is not the only factor in the pathogenesis, so the real cause and pathogenesis need further study.
Prevention
Infectious eczema-like dermatitis prevention
1, the disease can occur at any age, no seasonality, better treatment, the key is to deal with the original source, when the infection and exudation control, dermatitis can quickly improve.
2, allergic constitution or family history of allergies, to avoid a variety of external stimuli, such as hot water scalding, scratching, sun exposure, etc., try to avoid sensitization and irritating food.
3, clothing should be loose, to reduce friction and stimulation, do not let chemical fiber and wool directly contact the skin.
Complication
Contagious eczema-like dermatitis complications Complications pruritus
Such as secondary infection can occur with thick blister and purulent sputum, may be associated with systemic symptoms such as local lymphadenopathy and fever.
Symptom
Infectious eczema-like skin symptoms Common symptoms Inflammatory papules pustule abscess Itching scales crusting erysipelas appearance blister chest pimples
There is a chronic suppurative infection before the rash. The primary lesion can be a blisters or pustules, or an inflamed papule with scaly or crusted, or a wet red spot, often occurring symmetrically on the exposed area. Sometimes the earliest damage is a broken abscess, sputum, sputum, sinusitis, chronic otitis media, hemorrhoids, pupils, hemorrhoids or ulcers. It can also be a lesion of the nose, eyes or vagina, often when the local lesions are aggravated. The skin around the infected area has erythema, papules, blisters, abscesses, scars, and gradually spreads out into a piece of eczema-like dermatitis that flows out of the serous pus. The surface is crusted, when the symptoms are mild or the inflammation subsides. The affected area is dry and desquamate. When the affected area is heavy, it can be swollen, smashed, and exudate. There are obvious erythema, papules, small blisters, pustules and other acute eczema changes. It becomes eczema and the skin is damaged, and the boundary is irregular. Lymph nodes tend to be swollen, occasionally elevated body temperature, and extensive dermatitis can occur in other parts of the body due to their own sensitive reactions. Some patients often have linear or stripe eczema due to scratching. Inflammation, rash asymmetry, there is intense itching, but these are generally more mild eczema.
Examine
Infectious eczema-like dermatitis
The pathological changes of the disease, the epithelial layer of the epidermis is thick, edema, shallow can be eroded, often contains staphylococcus, dermal papillary edema congestion, inflammatory cell infiltration, laboratory tests for neutrophilia.
There is a chronic suppurative infection before the rash. The primary lesion can be a blisters or pustules, or an inflamed papule with scaly or crusted, or a wet red spot, often occurring symmetrically on the exposed area.
Diagnosis
Diagnosis and diagnosis of infectious eczema-like dermatitis
diagnosis
Diagnosis can be performed based on clinical manifestations and examinations.
Differential diagnosis
The main point of identification with atopic dermatitis is that there is no certain disease site in this disease, and there is no history of allergic disease in the family. The disease needs to be differentiated from contact dermatitis. The latter has a clear history of contact, acute onset, and clear skin lesions. After the cause is removed quickly, the disease should be differentiated from cutaneous candidiasis.
