Upper respiratory tract infection, pregnancy, stress, herb drugs, or withdrawal from prolonged use if systemic steroids may have provoked flares of pustular psoriasis in our patients.

• 虽然上呼吸道感染、怀孕、压力、服用不明中药、长期全身投与类固醇之断除徵症等情况可能引发脓疱发作，但多数患者(40%25)仍无法找出明确诱发因素。