Term
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Definition
begins in center and spreads to periphery
ex: tinea corporis (ring worm), tinea versicolor, pityriasis rosea |
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Term
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Definition
lesions run together
ex: urticaria (hives) |
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Term
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Definition
distinct, individual lesions that remain separate
ex: acrochordon (skin tags), acne |
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Term
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Definition
twisted, coiled spiral, snake like
ex: |
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Term
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Definition
| a scratch, streak, line or stripe |
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Term
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Definition
linear arrangement along a unilateral nerve route
ex: herpes zoster |
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Term
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Definition
clusters of lesions
ex: vesicles of contact dermatitis |
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Term
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Definition
"iris" resembles iris of eye, concentric rings of color in the lesions
ex: erythema multiforme |
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Term
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Definition
annular lesions grow together
ex: lichen planus, psoriasis |
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Term
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Definition
solely a color change, flat and circumscribed, less than 1cm
ex: freckles, flat nevi, hypopigmentation, petechiae, measles, scarlet fever |
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Term
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Definition
macules that are larger than 1 cm
ex: mongolian spot, vitiligo, cafe au lait spot, chloasma, measles |
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Term
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Definition
something you can feel (solid elevated circumscribed less than 1 cm - caused by superficial thickening in the epidermis
ex: elevated nevus (mole), lichen planus, molluscum, wart (verruca) |
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Term
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Definition
papules coalesce - surface elevation wider than 1cm - plateau-like, disk shaped
ex: psoriasis, lichen planus |
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Term
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Definition
solid, elevated, hard or soft, larger than 1cm - may extend deeper into dermis than papule
ex: xanthoma, fibroma, intradermal nevi |
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Term
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Definition
larger than a few cm in diameter, firm or soft, deeper into dermis - benign or malignant
ex: lipoma, hemangioma |
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Term
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Definition
superficial, raised, transient and erythematous, slightly irregular shape due to edema
ex: mosquito bite, allergic rxn, dermographism |
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Term
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Definition
| (hives) wheals coalesce to form extensive rxn, intensely pruritic (itching) |
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Term
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Definition
elevated cavity of free fluid up to 1 cm, a "blister" clear serum flows if wall is ruptured
ex: herpes simplex, early varicella, herpes zoster (shingles), contact dermatitis |
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Term
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Definition
> 1cm, usually single chambered (unilocular), superficial in epidermis, this walled, ruptured easily
ex: friction blister, pemphigus, burns, contact dermatitis |
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Term
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Definition
encapsulated fluid-filled cavity in dermis or subcutaneous layer, tensely elevating skin
ex: sebaceous cyst (wen) |
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Term
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Definition
turbid fluid (pus) in the cavity, circumscribed and elevated
ex: impetigo, acne |
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Term
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Definition
thickened, dried-out exudate left when vesicles/pustules burst or dry up (red-brown, honey, yellow per ingred - blood serum pus)
ex: impetigo, weeping eczematous dermatitis, scab after abrasion |
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Term
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Definition
compact, desiccated flakes of skin, dry or greasy, silvery or white from shedding of dead excess keratin cells
ex: scarlet fever or drug rxn - laminated sheets, psoriasis - silver, mica like, seborrheic dermatitis - yellow greasy, eczema, ichthyosis - lrg adherent laminated, dry skin |
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Term
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Definition
| benign proliferation of blood vessels in the dermis |
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