The skin dandruff (Latin squama; English: epidermal scale;. in short scale) is visible with the naked eye aggregation of corneocytes [1] desquamation (Latin Desquamatio; synonym: exfoliation, (waste). flaking, scaling) in the dermatological importance refers to the shedding of the uppermost horny layers the skin to form flakes of skin.
causes
As part of the constantly occurring, physiologically normal regeneration of human skin corneocytes are - individually or in small groups - invisible to the naked eye to be discharged to the stratum corneum. This is called Desquamatio insensibilis known [2].
If the parent of the epidermis is disturbed, the coordination is disturbed desquamation, and it comes to visible desquamation (Desquamatio sensibilis). [3] Only aggregates of 500 or more contiguous cells are visible to the human eye as dandruff. [4] The coordination disorder may be such as psoriasis, ichthyosis, seborrheic dermatitis or conditionally, or by trivial skin infections by a specific skin disease (eg sunburn) or minor trauma be triggered. Almost all inflammatory skin diseases cause in their course, often only in the course of healing, a visible dandruff. [3] At the cellular level Desquamatio sensibilis is usually accelerated cell division in the basal layer and then advance with impaired differentiation.
division
skin cells are differentiated by size and shape. The type of scaling may be indicative of the underlying disease [5].
by size
fine lamellar
* * mittellamellar
* Groblamellar
to form
* Ichthyosislike (Schildchenform): The ichthyosiform scaling loose round to square, lentil-sized or larger labels that are stuck in the center, from the outside from her. This is significant especially in ichthyosis vulgaris.
* Pityriasisform (Kleieform): Fine, kleieförmige scales occur in pityriasis rosea, pityriasis versicolor and measles in the convalescence stage. The appropriate scaling is as Desquamatio furfuracea (synonym: Desquamatio pityriasiformis, Defurfuratio) refers.
* Psoriasiform (platelet form)
* Leaves the skin form
scale is one of the lesions in dermatology.