Appearance of hair loss and possible etiologies

Pattem Central thinning (Female)
"M" - shaped thinning (temples / crown, male)
Androgenetic alopecia
"Moth-eaten" appearance Syphilis
Bizarre, incomplete thnining, with stubble Trichotillomania
Diffuse Scalp and body   Slopecai universalis
Scalp only 50% telogen Telogen effluvium
70% to 80% telogen Advanced telogen effluvium
Toxic exposure
Chemotherapy
Metabolic derangements
Exclamation-point hairs Alopecia totalis
Focal Patchy, exclamation-point hairs Alopecia areata
Scalp bogginess, fragile / easily broken hairs Tinea capitis
Patchy, incomplete thinning, with stubble Trichotillomania
Frontal / temporal, high-tension hairstyle Traction alopecia
Cellulitis, folliculitis Cicatricial alopecia