alopecia

Examples

 non-scarring alopecia

• alopecia areata
• alopecia mucinosa
• androgenic alopecia

 traumatic alopecia

• trichotillomania

 primary scarring alopecia of afro-textured hair

• central centrifugal cicatricial alopecia
• traction alopecia
• frontal fibrosing alopecia
• lichen planopilaris
• folliculitis decalvans
• syphilitic alopecia

 secondary scarring alopecia

• aplasia cutis congenita
• Cicatricial bullous pemphigoid
• Infectious (kerion, staphylococcal )
• Neoplastic (primary, metastasis )
• Connective tissue disease (morphea )
• Trauma (burn )
• Metabolic (amyloid, mucin )
• Granulomatous (sarcoid )

Forms

 scarring alopecia of afro-textured hair

• central centrifugal cicatricial alopecia
• traction alopecia
• frontal fibrosing alopecia
• lichen planopilaris

Diagnosis of alopecia

 primary scarring alopecia
 non-scarring alopecia

Common forms of scarring alopecias are :
 lymphocytic (discoid lupus erythematosus, lichen planopilaris, central centrifugal cicatricial alopecia, pseudopelade of Brocq),
 neutrophilic (folliculitis decalvans, dissecting folliculitis)
 mixed (acne keloidalis)

The non-scarring alopecias are :
 androgenic alopecia
 telogen effluvium
 alopecia areata
 trichotillomania
 traction alopecia

Open references

> Histopathology of alopecia: a clinicopathological approach to diagnosis. 2009.
https://onlinelibrary.wiley.com/doi/10.1111/j.1365-2559.2009.03439.x
doi : 10.1111/j.1365-2559.2009.03439.x