Inflammatory Dermatoses (Sheehan)
Inflammatory Dermatoses
Inflammatory Dermatoses
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Cartes-fiches
Macule
1˚ - flat lesion that differs from the surrounding skin only by color < 5mm
Patch
1˚ - flat lesion that differs from surrounding skin only by color > 5 mm
Papule
1˚ - solid, elevated lesion < 5 mm
Plaque
1˚ - elevated, flat-topped lesion > 5mm
Wheal
1˚ - firm, edematous, flat-topped papule or plaque resulting from infiltration of dermis with fluid that lasts < 24 hours
Vesicle
1˚ - circumscribed, elevated collection of fluid that is < 5mm*
Bulla
1˚ - circumscribed, elevated collection of fluid that is > 5 mm*
Pustule
1˚ - elevated collection of purulent fluid that varies in size
Nodule
1˚ - solid, palpable lesion located under the epidermis
Scale
2˚ - abnormal shedding or accumulation of stratum corneum
Crust
2˚ - dried serum, blood or purulent exudate on the skin
Excoriation
2˚ - linear or punctate erosion of epidermis secondary to scratching
Erosion
2˚ - focal loss of epidermis which does not penetrate the dermoepidermal junction, and therefore heals without scarring
Ulcer
2˚ - depressed lesion with focal loss of epidermis and dermis that heals with scarring
Lichenificaiton
2˚ - thickened skin with accentuation of skin lines secondary to chronic rubbing
Layers of normal skin (superficial to deep)
Stratum Corneum
stratum lucidum
stratum granulosm
stratum spinosum
stram basalis
Hyperkeratosis
increased thickness or hyperplasia of the cornified layer
Paraleratosis
hyperkeratosis in which pyknotic nuclei are retained in cornified layer
- Usually associated with decreased granular layer
- Seen in disease states with rapid cell turnover precluding normal maturation (psoriasis)
