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afya Pityriasis Rosea

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20160425222403 Ben  
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common, acute, papulosquamous, children and young adults
HHV7 ?
captopril, barbiturates, clonidine, gold
fawn coloured, slightly raised, large (2-10cms), oval scaly, limbs and trunk, 
herald patch
may be itchy
self limiting  (usually 6-8/52, may be 3-6/12)

||Guttate psoriasis|Pityriasis rosea|
|Prodrome|Classically preceded by a streptococcal sore throat 2-4 weeks|Many patients report recent respiratory tract infections but this is not common in questions|
|Appearance|'Tear drop', scaly papules on the trunk and limbs|Herald patch followed 1-2 weeks later by multiple erythematous, slightly raised oval lesions with a fine scale confined to the outer aspects of the lesions. May follow a characteristic distribution with the longitudinal diameters of the oval lesions running parallel to the line of Langer. This may produce a 'fir-tree' appearance|
|Treatment / natural history|Most cases resolve spontaneously within 2-3 months, Topical agents as per psoriasis, UVB phototherapy	|Self-limiting, resolves after around 6 weeks|