Is caused by a complex internal and external trigger factors caused by a delayed type of allergic reaction. Its characteristics are manifested as lesion pleomorphism, distributed symmetry, can occur repeatedly, severe itching. Acute eczema papules, Qiu herpes is its main performance.
3. Atopic dermatitis
The etiology is more complex and is generally thought to be related to a variety of factors. Genetic factors are the main factors of this disease. Patients often have congenital allergies, infants and more children, the main manifestations of erythema papules. The disease is divided into three stages at different ages. Infants occur in the head and face, can also be developed to the trunk, limbs, manifested in the erythema-intensive needle large pimples. Qiu herpes, water cancer and exudate. Dry rash is dense small pimples, surface dry with scales. Children account for about 80% of the disease before the age of 5, according to the rash form is divided into eczema and prurigo type. The former for the needle big pimples, Qiu herpes or small water scar, can be integrated into the film, occur in the elbow fossa in the fossa; the latter for the whole measured miliary to mung bean pimples, skin color or brown, pimple dry surface rough covered with thin Crazy, scratched or blood crazy, severe itching. Adult rash for the erythema pimple, after the fusion was flaky hypertrophy and showed a change of moss.
4. drug rash
Is due to drugs through a variety of ways into the human body caused by skin, new film reaction rash. Drug rash lesions varied, a variety of clinical manifestations. Measles-like drug eruption for a wide range of symmetrical distribution of rice grain red papules, can be integrated with each other, papules scattered and concentrated in the coexistence of intensive, itching heavier, is the most common type of drug eruption. In recent years to ammonia penicillin caused by more. Erythema multiforme drug eruption, characterized by mung bean to broad bean edema erythema papules, the central water cancer or was purple, multi-symmetry in the limbs. Scabies-like drug eruption, manifested as follicular papules similar to acne, often due to iodine, fill the preparation, corticosteroids caused. Purple epilepsy or vasculitis drug eruption, manifested as needle, bean or larger purple epilepsy, uplift leather, the center can be necrosis.
5. papules and other measles
It is generally believed that mosquito bites cause delayed allergic reactions, or allergies caused by food, drugs, and the like. Found in infants and children and more disease. A rash of red wind-like pimples scattered or clustered for limbs or torso. Mung bean to peanuts large, slightly spindle-shaped, and some centers can occur small water cancer, old and new rash often exist. Consciously itchy, rash recurring.
(B) papules scales skin disease papules
1. The cause of psoriasis is unknown. When the skin lesions from the beginning of the inflammatory red papules, miliary to the beans large, later gradually expanded into a patch, the surface covered with silver-white scales, scraping scales appear a layer of shiny film called "film phenomenon", then scraping Occurrence of point bleeding is the characteristics of this disease.
2. Psoriasis drip type psoriasis is more common, skin lesions distributed with the limbs, but not in the head and face. Skin lesions for the size of the red rash, slow course, no point bleeding phenomenon. Pox cancer type psoriasis is relatively rare, for the needle to the beans large round papules, Qiu herpes, the center prone to necrosis.
3. Flat moss Xue skin lesions for the flat pimples, purple, miliary to the beans large, polygonal, clear boundary. Thin itch obvious, skin lesions can also be integrated into small patches.
4. sclerosing atrophic moss Xue skin lesions for the porcelain white flat papules, the surface of a small blackheads acne-like hair follicle horny bolt, surrounded by flush. Pimples began to large, round or irregular shape of beans, and some central depression, palpation harder.
5. Hair red pityriasis can be divided into congenital or acquired acquired, the former often seen in children for adults in the latter. Occur in the fingers l-2 refers to the back of the joint for its characteristics. Limb extension side, trunk. Face can also be involved. Lesions are hair follicle keratotic papules and scaly pale red patches.
6. golden yellow moss Xue unknown etiology is rare, adults and children can be disease. Skin lesions for the rusty miliary large flat hill. Rash, cluster was moss Xue-like change. Pathological changes in the upper part of the dermis has a broad normal connective tissue area, under the banded infiltration, mainly lymphocytes and a small amount of tissue cells.
7. Gloss bitter abscess cause, children to the elderly can be cut, lesions for the needle to the miliary large pimples, round or polygonal, was hemispherical bulge or conical or flat. Can be normal skin color, light e color or light red, solid surface shiny, scattered in the non-fusion, occur in the penis, glans, abdomen, forearm, etc.. Pathological changes, each pimple at the Department of dermal papillary limitations of spherical mononuclear cell infiltration, both sides of the epidermis extension was concealed.
(C) nerve factors caused by pimples
1. Neurodermatitis began to suffer from the skin of the skin itchy, scratching after the miliary grain to the big papules, round or polygonal, after the gradual increase in fusion was moss Xue, made in the neck, elbow, can and other parts.
2. prurigo is a group of acute or chronic inflammatory papular skin diseases. Acute simple prurigo, common middle-aged women, for the sudden occurrence of green beans to large flat papules soybeans, beginning for the light red and then become dark red, scattered in the distribution. Normal prurigo, pimples smaller, more associated with the wind group disappeared faster, after a solid papules were the main. Occur in the limbs or torso.
3. Nodular prurigo is generally associated with mosquito bites. Beginning for the red pimples, after the hemispherical nodules, big grain of the hard touch, the surface keratinized rough, reddish brown, itching, scratching scratch marks and knot. Occur in the limbs stretch side, especially in the calf stretch side more common. 4. pregnant prurigo seen in pregnant women, especially pregnant more than two times pregnant women, for the pink or normal skin color pimples, mung bean, scattered symmetry, occur in the trunk, upper arm and stock, cancer itching violently, at night even.
(D) vasculitis of skin disease papules
1. Anaphylaxis is a superficial small vasculitis, skin lesions are small and scattered. Of the silt points slightly higher than the leather surface, was spotted pimples occur in the limbs stretch side symmetry. Especially in the biped ankle and lower leg as a good place.
2. allergic skin vasculitis lesions for the pleomorphic, can be erythema, pimples, wind group and purple epilepsy, but the characteristic lesions are purple