2 derm pattern recognition 1
TRANSCRIPT
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CASE STUDIES IN DERMATOLOGIC PATTERN
RECOGNITIONPart 1
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PATTERN RECOGNITION IS THE CAPACITY TO DESCRIBE A RASH OR LESION USING A VARIETY OF PHYSICAL CHACTERISTICS IN ORDER
TO LIMIT THE DIFFERENTIAL DIAGNOSIS
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PHYSICAL CHARACTERISTICS OF ALL
RASHES AND LESIONS
• 1.BASIC MORPHOLOGY
• 2.SIZE
• 3.SHAPE
• 4.COLOR
• 5.PATTERN
• 6.DISTRIBUTION
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EXAMLPES OF BASIC MORPHOLOGY
• 1.MACULE AND PATCH
• 2.PAPULE AND NODULE
• 3.PUSTULE
• 4.WHEAL
• 5.VESICLE AND BULLA
• 6.PLAQUE
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MACULES AND PATCHES
MACULES ARE FLAT AND THEREFORE NOT RECOGNIZED
BY TOUCH BUT RATHER A CHANGE IN COLOR FROM YHE SURROUNDING SKIN. PATCHES
ARE LARGER MACULES
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MONGOLIAN SPOTS
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PAPULES AND NODULES
PAPULES ARE ELEVATED SOLID LESIONS UP TO.5 CM IN
DIAMETER. NODULES ARE LARGER THAN PAPULES
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NEUROFIBROMA
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PUSTULES
PUSTULES ARE EPIDERMAL OR UPPER DERMAL COLLECTIONS
OF PUS. ABSCESSES ARE DEEPER PUSTULES
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BULLOUS IMPETGO
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ABSCESSES
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WHEALS
WHEALS ARE ROUNDED PALE RED PAPULES OR PLAQUES
CAUSED BY THE EXTRAVASATION OF FLUID
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URTICARIA
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VESICLES AND BULLAE
VESICLES ARE LESIONS FORMED BY FLUID CREATING A
CLEAVAGE PLANE BENEATH THE STRATUM CORNEUM.
BULLAE ARE LARGER VESICLES
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IMPETIGO
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PLAQUES
PLAQUES ARE RAISED LESIONS WITH A FLAT TOP. THE RISE IN
ELEVATION IS MUCH LESS THAN YHR WIDTH OF THE
LESION
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PSORIASIS
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EXAMLPLES OF LESION SHAPE
• 1.ANNULAR.. Like a ring• 2.NUMMULAR… like a coin• 3.LINEAR• 4.OVAL• 5.TARGET• 6.SERPIGENOUS• 7.RETICULATE .. Forming a network• 8.STELLATE …star like
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ANNULAR
ANNULAR LESIONS ARE CIRCULAR AND HAVE A
CENTER WITH AN APPEARANCE DIFFERENT FROM THEIR
EDGE OR BORDER
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KERATOACANTHOMA
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NUMMULAR
NUMMULAR LESIONS TAKE ON THE APPEARANCE OF A FILLED
CIRCLE OR COIN
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NUMMULAR ECZEMA
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LINEAR
LINEAR LESIONS ARE LONG RELATIVE TO THEIR WIDTH AND GENERALLY STRAIGHT
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KELOID
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OVAL
THE WORD IS SELF EXPLANATORY
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FIXED DRUG ERUPTION
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TARGET
TARGET LESIONS ARE MADE UP OF CONCENTRIC CIRCLES OF WHITE AND RED FORMING A
BULLSEYE APPEARANCE
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ERYTHEMA MULTIFORME
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SERPIGENOUS
LESIONS THAT ARE LONG AND WAVEY WITH A SNAKE-LIKE
APPEARANCE
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LARVA MIGRANS
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RETICULATE
LESIONS WITH AN INTERCONNECTED OR LACE-
LIKE APPEARANCE
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STRETCH MARKS
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STELLATE
LESIONS WITH A STAR-LIKE APPEARANCE USUALLY FROM
A RADIAL SPREAD FROM A CENTRAL FOCUS
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SUPERFICIAL VARICOSITIES
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EXAMPLES OF LESION PATTERN
• 1.GROUPED
• 2.DISSEMINATED
• 3.DERMATOMAL
• 4.SYMMETRIC
• 5.PHOTOSENSITIVE
• 6. CONFLUENT
• 7.INTERTRIGENOUS
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GROUPED
MULTIPLE SIMILAR LESIONS ORGANIZED IN CLOSE
PROXIMITY
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GENITAL WARTS
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DISSEMINATED
LESIONS WHICH ARE SCATTERED RANDOMLY OVER
ALL OR MOST OF THE BODY
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GENERALIZED DRUG
REACTION
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DERMATOMAL
LESIONS THAT FOLLOW THE PATH OF A PERIPHERAL
SENSORY NERVE
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HERPES ZOSTER
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SYMMETRIC
LESIONS THAT ARE MIRROR IMAGES OF EACHOTHER FROM ONE SIDE OF THE BODY TO THE
OTHER
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ONYCHOMYCOSIS
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PHOTOSENSITIVE
LESIONS LIMITED TO THE SUN EXPOSED PARTS OF THE BODY
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PHOTOSENSITIVE DRUG ERUPTION
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CONFLUENT
THE PROCESS OF SMALLER LESIONS COMING TOGETHER UNTIL THEY FORM A LARGE
LESION BY MERGING
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TINEA CORPORIS
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INTERTRIGENOUS
LESIONS THAT ARE LOCATED BETWEEN SKIN FOLDS SUCH AS
THE AXILLA, GROIN OR BETWEEN FINGERS OR TOES
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LESION SIZE
• USUALLY DESCRIBED IN MILLIMETERS OR CENTIMETERS
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EXAMPLES OF LESION OR RASH COLOR
• 1.HYOPIGMENTED• 2.HYPERPIGMENTED• 3.WHITE• 4.BLACK• 5.BLUE• 6.YELLOW• 7.VIOLACEOUS• 8.VARIEGATED
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EXAMPLES OF LESION DISTRIBUTION
• 1.HEAD• 2.ORAL• 3.AXILLARY• 4.TRUNCAL• 5.ANOGENITAL• 6.INGUINAL• 7.DEPENDENT• 8.PEDAL