Pityriasis lichenoides
Pityriasis
lichenoides is uncommon. It occurs in two forms. The numerous small circular
scaly macules and papules of the chronic type are easy to confuse with guttate
psoriasis. However, their scaling is distinctive in that single silver-grey
scales surmount the lesions (mica scales). The acute type is characterized by
papules that become necrotic and leave scars like those of chickenpox. More
often than not there are a few lesions of the chronic type in the acute variant
and vice versa. UVB radiation can reduce the number of lesions and spontaneous
resolution occurs eventually.
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