Pustular psoriasis
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Pustular psoriasis causes clearly defined pus-filled sores. It can occur in widespread patches or in smaller areas on the palms or soles, as shown here. This rare form of psoriasis can develop quickly, with blisters forming just hours after your skin becomes inflamed and sore. The blisters clear up within several days, but recur. Possible causes include medication withdrawal and infection.

Small patches of pustular psoriasis may be treated with a corticosteroid ointment. Larger patches usually require prescription oral medication, elimination of the underlying cause, if possible, and other topical and oral or injected (systemic) therapies. Light therapy may be useful once the blisters clear up and the skin is less irritated.

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