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Skin Lesions And Diagnosis
Thorough approach to the evaluation decreases the risk of
making an in correct diagnosis or overlooking another
diagnosis
Knowledge and appropriate use of dermatological
terminology are fundamental
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The entire mucocutaneous surface, as well as the hair and nails, should
be examined whenever reasonable.
Diseases have characteristics morphology and distribution.
Common pitfalls in dermatologic diagnosis exist and can be avoided.
Approach To The Patient
Introduction
History
History of present illness
Systemic review
Past medical & surgical history
Family history
Social history
Drug history
•Examination- cutaneous
- General physical
- Loco-regional
- Systemic
Differential diagnosis
Provisional diagnosis
Investigations
Final diagnosis
Treatment
Follow up
HISTORY
Dermatology a visual specialty
But In most cases, a carefully directed history is important
for :
- refining the diagnosis,
-for identifying further investigations
-and to address issues that may be important for optimal
management
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Perform a brief examination initially before taking history
it helps to obtain streamlined and more focused history
later
Presenting complaint:
Symptoms.
Itch is the prime dermatological symptom
Rash
History of a growth
Symptoms usually parallel development of eruption but discordance can be diagnostically useful
History of a rash: key
questions
When did it start?
Did it itch, burn or hurt?
Where on the body, did it start?
How has it spread?
How have individual lesions changed?
Provocative factors?
Previous treatments & response?
History of a growth: key questions
How long has the lesion been present?
Has it changed, grown, bleed, itched or failed to heal?
Systemic review
Review of systems as indicated by
clinical situation, with particular attention to symptoms indicating a
possible connection between cutaneous signs
and disease of other organ systems.
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Review of symptoms for growth suspicious for,
or associated with malignancy.
Particular attention to symptoms of metastasis
(weight loss, fever, headache ,abdominal pain,
bone pain etc.)
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Constitutional symptoms
“Acute illness” syndrome: headaches, chills,
fever, weakness
“Chronic illness” syndrome: fatigue, weakness,
anorexia, weight loss, malaise
4. Family history
Family medical history , particularly of skin disorders and of atopy.
Family history of skin and other cancers.
5. social history
Social history with particular reference
to occupation, hobbies , sun exposure, tobacco smoking, alcohol use,
recreational drugs , travel, sexual orientation and exposure.
LABORATORY STUDIES
Special procedures as determined by individual
clinical situation:
Dermatoscopy
Hand lens
Biopsy for histopathologic & other analysis (electron
microscopy, immunofluorescence, special stains)
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Gram stain of scales , crust or exudates
Potassium hydroxide preparation for yeast or fungi
Tissues to be minced for bacterial and fungal culture
Cytological preparation (tzanck smear) in vesicular &
bullous eruptions
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Swab for bacterial, fungal, viral culture
Wood’s lamp examination of urine
for porphyrins & of hair & skin for fluorescence or for
changes in
pigmentation
Patch testing for allergic contact dermatitis
Final diagnosis
Re-examination over time
More than one biopsy may be required for definitive diagnosis
Examination of the
dermatologic patient
Scope of the complete cutaneous examination:
it includes examining entire skin
Identification of potentially harmful lesions
Identification of benign lesion
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Finding hidden clues to diagnosis
(e.g. scabies lesions on penis,
psoriatic plaques on buttocks,
Wickham striae of lichen planus
on buccal mucosa.)
The pre-requisite of dermatologic diagnosis is recognition of
the type of skin lesion
the color
margins
Consistency
shape
arrangement
distribution of lesions
Recommended tools for skin examination
A magnifying tool such as loupe, magnifying glass,
dermatoscope.
A bright focused light
Glass slides
Alcohol pads to remove scales or surface oil
Gauze pads or tissues with water
Gloves
A Ruler for measuring lesions
A surgical blades for scraping or incising lesion
Camera for photographic documentation
A wood’s lamp for highlighting pigmentary changes
Inspection :
Observe the patient at a distance for any kind of
asymmetry , obesity, pallor, fatigue , jaundice.
Next examine the patient in a systematic way
from head to toe.
Palpation:
Palpate the patient for any kind of mass ,
growth,
whether they are soft ,fleshy, firm, tender
fluid-filled.