Skin Disorders Flashcards
Beings in center and spreads to periphery
Ex: Tinea corporis (ringworm), tinea versicolor, pityriasis rosea
Annular/Circular
Lesions that merge together
Ex: Urticaria (hives)
Confluent
Distinct, individual lesions that remain separate
Ex: Molluscum
Discrete
Clusters of lesions
Ex: Vesicles of contact dermatitis
Grouped
Twisted, coiled, spiral, snakelike
Gyrate
Resembles of eye, concentric rings of color in the lesion
Ex: Erythema multiforme
Target/iris
Scratch, streak, line or stripe
Linear
Annular lesions that grow together
Ex: Lichen planus, psoriasis
Polycyclic
Linear arrangement along a nerve route
Ex: Herpes zoster
Zosteriform
Soley a color change
Flat and circumscribed
< 1cm diameter
EX: Freckles, flat nevi, hypopigmentation, petechiae, measles, scarlet fever
Macule
Macules > 1 cm diameter
EX: Mongolian spot, vitiligo, cafe au lait spot, chloasma, measles rash
Patch
Palpable, solid, elevated, circumscribed, < 1 cm diameter
Caused by superficial thickening in the epidermis
EX:
Elevated nevus (mole), lichen planus, molluscum, wart (verruca)
Papule
Papules that coalesce to form elevation wider than 1cm
Plateau like, disc shaped lesion
Ex:
Psoriasis, lichen planus
Plaque
Superficial, raised, transient, and erythematous, slightly irregular shape because edema (fluid held diffusely in the tissues)
Ex: Mosquito bite, allergic reaction, dermographism
Wheal
Wheals that coalesce to form extensive reaction; intensely pruritic
Urticaria/Hives
Solid, elevated, hard or soft, > 1 cm diameter; may extend deeper into dermis than papule
Ex:
Xanthoma, fibroma, intradermal nevi
Nodule
Larger than a few centimeters in diameter, firm or soft, deeper into dermis; may be benign or malignant
Ex:
Lipoma, hemangioma
Tumor
Elevated cavity containing free fluid, up to 1cm; clear serum flows if wall is ruptured
Ex:
Herpes simplex, early varicella (chicken pox), herpes zoster (shingles), contact dermatitis
Vesicle/ blister
Usually single chambered (unilocular); superficial in epidermis; > 1 cm diameter; thin walled and so it ruptures easily
Ex:
Friction blister, pemphigus, burns, contact dermatitis
Bulla
Encapsulated fluid filled cavity in dermis or subcutaneous layer; tensely elevating skin
Ex:
Sebaceous cyst, trichilemmal cyst (wen)
Cyst
Cavity filled with turbid fluid (pus); circumscribed and elevated
Ex:
Impetigo, acne
Pustule
