greasy scaling
Introduction
Introduction The scales are the stratum corneum that is shed or about to fall off. Seborrheic dermatitis usually occurs in the area where the sebaceous glands are abundantly distributed. It occurs on the basis of sebum overflow. It often spreads downward from the head. It has oily scaly yellow-red patches with clear boundaries, symmetric distribution, and conscious pruritus. Easy to recurrent. The normal epidermis contains three layers of cells: keratinocytes, pigment forming cells, and Langerhans cells. Among them, keratinocytes are associated with this disease. Keratinocytes are composed of 5 layers of cells, namely: basal layer, spinous layer, granular layer, transparent layer and stratum corneum. The growth cycle of the five-layer cells is generally about 12 days, and finally the stratum corneum is formed, which falls off as the nucleus disappears.
Cause
Cause
The cause of greasy scales:
The normal epidermis contains three layers of cells: keratinocytes, pigment forming cells, and Langerhans cells. Among them, keratinocytes are associated with this disease. Keratinocytes are composed of 5 layers of cells, namely: basal layer, spinous layer, granular layer, transparent layer and stratum corneum. The growth cycle of the five-layer cells is generally about 12 days, and finally the stratum corneum is formed, which falls off as the nucleus disappears. When the skin has inflammation and other damage, the growth and metabolism of the epidermis is accelerated, and the cycle is shortened, so that normal keratinogenesis is disturbed, parakeratosis occurs, and the cell nucleus enters the keratinized layer, but the keratin is not dense and loosely forms scales.
Examine
an examination
Related inspection
Physical examination of skin diseases, skin smear microscopy
Inspection and diagnosis of greasy scales:
Greasy scaly yellow-red patches appear in the sebum spill area, the boundary is clear, consciously itching, chronic, and the diagnosis is easier.
Diagnosis
Differential diagnosis
Identification of symptoms that are confusing with greasy scales:
The clinical manifestations of different parts are different. The clinical manifestations of seborrheic dermatitis are different due to the difference in location and damage:
1, scalp seborrheic dermatitis: began as a large grayish white or oily scaly patch, and later gradually expanded into a large patch with clear boundaries, severely the entire scalp is covered with greasy odor and thick hair and hair loss .
2, face, ear, ear and neck seborrheic dermatitis: often spread from the scalp, yellow-red or greasy scaly rash.
3, beard seborrheic dermatitis: there are two types, one is mild redness and swelling of the hair follicle, inflammation with small light brown crusted, that is, "sore", stubborn and difficult to cure; the other is disseminated red, greasy Sexual scales, pustules formed deeper, involving the entire hair follicle.
4, trunk seborrheic dermatitis: the first small reddish brown hair follicle papules with greasy scales, then gradually become the center of the fine scaly scales, the edge of the dark red papules and large greasy scales of the ring patch, more than before Between the chest and shoulder blades.
5, wrinkled seborrheic dermatitis: more common obese middle-aged people, skin lesions in the form of disseminated frictional erythema, erythema boundary is clear, there are greasy scales.
6, limbs seborrheic dermatitis: damage manifested as eczema patch.
7, infant seborrheic dermatitis: manifested as erythema, scales, round or oval, clear boundaries.
Its size, thickness and shape, scaly scales such as tinea versicolor, white pityriasis; large flaky scaly such as exfoliative dermatitis; pale yellow oily scales such as seborrheic dermatitis; White scales such as psoriasis. It can also be seen on the skin of normal people. There are two kinds of dry scales and greasy scales.
Greasy scaly yellow-red patches appear in the sebum spill area, the boundary is clear, consciously itching, chronic, and the diagnosis is easier.
