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Allopecia - Differential Diagnosis Framework for Hair Loss

Localized / Focal Hair Loss Pattern:
 • Scarring Alopecia:
Localized / Focal ... Capitis - Skin ... Traction alopecia Diffuse ... Scaling, pustules, crusts ... Examine the entire skin
Primary Dermatological Lesions
Primary lesions are physical changes in the skin considered to be caused directly by
considered to be caused ... a generalized disorder ... to masking of local ... #Nomenclature #Atlas ... #Key #Basics
PALM RASHES 
Common features and patterns:
1.	Color:
o	Red or erythematous: Common in inflammatory or allergic reactions.
o	Purple or purpuric:
suggest vascular or hematologic ... depigmentation disorders ... occur in chronic skin ... o Moist or oozing ... Drug Reactions: Diffuse