Psoriasis Differential Diagnosis

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

==--==