Differential Diagnosis
Guttate psoriasis may be confused with:
¬ Discoid dermatitis (more itch, vesicles, dry rather than
plate-scale)
¬ Tinea corporis (elevated border, slowly extending edge, positive
mycology)
¬ Pityriasis rosea (herald patch, fir-tree distribution of oval
plaques, trailing scale)
Erythrodermic psoriasis may be confused
with:
¬ Erythrodermic atopic dermatitis (intense pruritus, exudative )
¬ Drug eruption (due to drug commenced within prior 8 weeks)
¬ Pityriasis rubra pilaris (cephalo-caudal spread, follicular
prominence)
Generalised pustular psoriasis may be
confused with:
¬ Acute generalised exanthematic pustulosis (drug eruption that
rapidly settles with withdrawal of drug, also known as ‘AGEP’ and more common
in those with known psoriasis)
¬ Bacteraemia and bacterid: cutaneous pustules arising during gram
positive and gram negative septicaemia
¬ Infected generalised atopic and/or seborrheic dermatitis
¬ Pityriasis rubra pilaris
¬ Reiter syndrome
¬ Folliculitis
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