|
Androgenetic
alopecia |
Telogen
effluvium |
Alopecia
areata |
Hair loss
distribution |
Focal balding
pattern: Hamilton/Norwood (men)
Ludwig (women) |
Generalized |
Usually patchy but
can be generalized |
Course |
Gradual onset with
progression |
Onset abrupt/trigger
factor |
Onset abrupt; often
waxes and wanes with relapses |
Appearance |
Thinning with or
without bare patches. Bare patches are gradual, not abrupt |
Thinning with no bare
patches |
Thinning with abrupt
bare patches |
Shedding |
Minimal |
Prominent |
Prominent |
Age onset |
Onset at puberty or
older |
Onset at any age, but
usually not childhood |
Onset at any age,
majority have their first patch before the age of 20 |
Pull test |
Usually negative |
Positive;telogen
hairs |
Positive;dystrophic
anagen and telogen hairs |