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Clinically classification of Alopecia Areata


Classic Forms –

Single or unifocal plaque- here, there is a single, round or oval, smooth alopecic plaque. The skin colour is normal, with easily pluckable normal hair at the periphery of the plaque with typical exclamation mark hair.

Multiple or multifocal plaques- alopecic plaques appear at multiple areas.


Ophiasic alopecia areata – Hair loss occurs along the line of temporo-occipital implantation,giving rise to an extensive alopecic area.


Alopecia totalis – there is total loss of terminal hair of the scalp without affecting hair on other body parts. It can be associated with ungula involvement.


 Alopecia universalis – There is total loss of body hair, involving the scalp, eyebrows, eyelashes, beard, moustache, armpits, genital areas.


 Atypical Forms –


Sisaifo type( inverse ophiasis) – the hair loss involves the entire scalp except the lower margins,along the line of temporo-occipital implantation. It is the inverse clinical image of the ophiasis form.


 Reticular alopecia areata – Multiple alopecic plaques occur separately by narrow bands of preserved hair.


Diffuse alopecia areata – The hair loss is acute and widespread. It is the most difficult form to diagnose.


Unknown etiology


Associations- Abnormal Thyroid function tests in 25% cases Auto antibodies to gastric parietal cells, thyroid ANA bodies in 24% cases (DNA)


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