Myth: Systemic steroids cause pustular psoriasis
The advent of biologic therapy for psoriasis has changed the landscape of treatments offered to patients. Nevertheless, systemic therapies still play an important role, according to the American Academy of Dermatology psoriasis treatment guidelines, due to their oral route of administration and low cost compared to biologics. They are options for patients with moderate to severe psoriasis that is unresponsive to topical therapies or phototherapy. However, many dermatologists feel that it is inappropriate to prescribe oral steroids to psoriasis patients due to the risk for steroid-induced conversion to pustular psoriasis, the long-term side effects of steroids, and deterioration of psoriasis after withdrawal of steroids.
Pustular psoriasis appears clinically as white pustules (blisters of noninfectious pus) surrounded by red skin. The pus consists of white blood cells. There are a number of triggers in addition to systemic steroids, such as internal medications, irritating topical agents, overexposure to UV light, and pregnancy. Stopping an oral steroid abruptly can cause serious disease flares, fatigue, and joint pain.
Westphal et al described the case of a 70-year-old woman with palmoplantar psoriasis who was diagnosed with acute generalized exanthematous pustulosis that was treated with corticotherapy by injection and then oral prednisone. She experienced improvement, but her symptoms worsened when she was in the process of reducing the prednisone dose. The dose was increased again, and the same worsening of symptoms was experienced when the dose was reduced. After completely abandoning oral steroid therapy, she developed a severe case of generalized pustular psoriasis that was treated with acitretin. This case illustrates the dangerous consequences of abruptly discontinuing oral steroids.
However, dermatologists may be using oral steroids for psoriasis more often than treatment guidelines suggest. In 2014, Al-Dabagh et al evaluated how frequently systemic corticosteroids are prescribed for psoriasis in the United States. The researchers reported, "Despite the absence or discouragement of systemic corticosteroids in psoriasis management guidelines, systemic corticosteroids are among the most common systemic treatments used for psoriasis." They found that systemic corticosteroids were prescribed at 650,000 of 21,020,000 psoriasis visits, of which 93% were visits to dermatologists. Prednisone was the most commonly prescribed systemic corticosteroid, followed by methylprednisolone and dexamethasone. To prevent rebound flares, systemic corticosteroids were prescribed with a topical corticosteroid in 45% of the visits in patients with psoriasis as the sole diagnosis. They concluded, "The striking contrast between the guidelines for psoriasis management and actual practice suggests that there is an acute need to better understand the use of systemic corticosteroids for psoriasis."
The benefits of systemic corticosteroids versus the frequency of adverse reactions should be weighed by dermatologists and patients to make evidence-based decisions about treatment. Patients should take oral steroids exactly as prescribed by physicians.
References
Al-Dabagh A, Al-Dabagh R, Davis SA, et al. Systemic corticosteroids are frequently prescribed for psoriasis. J Cutan Med Surg. 2014;18:195-199.
Delzell E. What you need to know about steroids. National Psoriasis Foundation website. https://www.psoriasis.org/advance/what-you-need-to-know-about-steroids. Published September 2, 2015. Accessed January 13, 2017.
Menter A, Korman NJ, Elmets CA, et al. Guidelines of care for the management of psoriasis and psoriatic arthritis: section 4. guidelines of care for the management and treatment of psoriasis with traditional systemic agents. J Am Acad Dermatol. 2009;61:451-485.
Pustular psoriasis. National Psoriasis Foundation website. https://www.psoriasis.org/about-psoriasis/types/pustular. Accessed January 13, 2017.
Westphal DC, Schettini APM, de Souza PP, et al. Generalized pustular psoriasis induced by systemic steroid dose reduction. An Bras Dermatol. 2016;91:664-666.
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