Diseases of the Skin Appendages. Alopecia areata. Characterized by rapid and complete loss of hair in one , or more often several round or oval patches Usually on the scalp, bearded areas, eyebrows and eyelashes 1-5 cm
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However, there is a higher incidence in patients with atopic dermatitis, Down syndrome, LP, LE, thyroiditis, MG and vitiligo
Nails may develop uniform pits that may form transverse or longitudinal lines – 10 %
May be assoc with depression or anxiety
TX – psychotherapy, behavioral therapy or an appropriate psychopharmacologic medication
With polarized microscopy the hair shows alternating bright and dark regionstrichothiodystrophy