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Histology of Skin Terminology of Skin Lesions
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SUBCUTANEOUS FATTY TISSUE (hypodermis)
EPIDERMIS ● keratinocytes (5 layers) ● melanocytes ● Langerhans cells ● Merkel cells (basement membrane) DERMIS ● fibroblasts ● collagen, elastic fibres ground substance ● sebaceous glands ● sweat glands ● hair follicles + m.arrector ● nerve fibres special nerve corpuscle ● blood and lymph vessels SUBCUTANEOUS FATTY TISSUE (hypodermis) ● lobes of fatty tissue ● blood vessels ● lymph vessels
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Description of Skin Lesions
Primary and secondary lesions (eflorescence) single or multiple grouped (multiple lesions grouped in one area) disseminated (exanthema – widespread discrete lesions) arranged (in line, in ring, snake-like…)
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Primary Lesion MACULE (spot)
any flat lesion, circumscribed discoloration, size < 1cm PATCH = larger macule with some surface changes
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Primary Lesion PAPULE any elevated lesion, size < 1cm, various color, papules may become confluent and form plaques
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Primary Lesion NODUL any elevated, circumcribed lesion, size > 1cm in both diameter and depth
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URTICARIA (weal, hives, nettle-rash)
Primary Lesion URTICARIA (weal, hives, nettle-rash) a firm plaque resulting from dermal oedema, it is transient - may last only a few hours
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Primary Lesion VESICLE (blister) a fluid-filled lesion, size < 1cm, BULLA - size > 1 cm in diameter
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Primary Lesion PUSTULE a circumscribed collection of leukocytes and fluid, size < 1cm
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Secondary Lesions scale erosion ulcus excoriation fissure crust
eschar (necrosis) erosion ulcus excoriation fissure
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a collection of dried serum, blood or pus, and cellular debris
Secondary Lesion CRUST a collection of dried serum, blood or pus, and cellular debris
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Secondary Lesion SCALE (squama)
an excess dead keratinocytes that are produced by abnormal keratinization and shedding, scale are dry and usually whitish or yellowish
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Secondary Lesion ESCHAR (necrosis) (e.g. bedsore, burn…)
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Secondary Lesion FISSURE a linear split in epidermis or dermis, with sharply defined vertical walls, over a joint or along a skin crease (skin isn´t flexible due to mycosis, eczema, psoriasis…)
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Secondary Lesions EXCORIATION a localized damage to the skin due to scratching EROSION a partial loss of epidermis, heals without scarring
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Secondary Lesion ULCER a full thickness loss of epidermis end dermis, which will heal with scarring
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Lesions can be: single or multiple
grouped (multiple lesions grouped in one area… …are confluent in one area) disseminated (exanthema = widespread discrete lesions) arranged (lesions form some configuration – e.g. in line, in ring, snake-like…)
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Arrangements of Lesions
linear configuration serpiginous configuration moniliform configuration
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Arrangements of Lesions
zosteriform configuration herpetiform conf. geografical configuration
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Arrangements of Lesions
circinate, semicircinate configuration iris form (concentric circles) annular conf.
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…erythroderma, erythema atrophy, lichenification
Other Changes …erythroderma, erythema atrophy, lichenification papilomatosis, pachydermatosis hyperpigmentation, depigmentation scars….
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Describing of Lesions:
sites involved and distribution (a-symmetrical, predilection sites; arrangement, single or multiple) size (mm, cm) shape (round, oval, irregular, pedunculated…) surface features (smooth, rough, shiny, dull, squamous, uneven…) demarcation - border of lesion (well defined or circumscribed, poorly defined…) color (pink, red, purple, white, brown, yellowish…) consistency (soft, firm, normal, hard, elastic…) surroundings (with inflammation, normal…)
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Blisters, pustules: blister roof – thin, thick, flaccid… content – clear, turbid, haemorrhagic… Ulcers: base – deep x shallow, uneven, clear, coated, with granulation tissue… edge – undermined, collowed, flat, adjacent, with epitelization…
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