The many variants of psoriasis

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Applied Evidence

The many variants of psoriasis

J Fam Pract. 2020 May;69(4):192-200

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References

1. Jackson R. John Updike on psoriasis. At war with my skin, from the journal of a leper. J Cutan Med Surg. 2000;4:113-115.

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3. Helmick CG, Lee-Han H, Hirsch SC, et al. Prevalence of psoriasis among adults in the U.S.: 2003-2006 and 2009-2010 National Health and Nutrition Examination Surveys. Am J Prev Med. 2014;47:37-45.

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5. Fahlén A, Engstrand L, Baker BS, et al. Comparison of bacterial microbiota in skin biopsies from normal and psoriatic skin. Arch Dermatol Res. 2012;304:15-22.

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7. Millsop JW, Bhatia BK, Debbaneh M, et al. Diet and psoriasis, part III: role of nutritional supplements. J Am Acad Dermatol. 2014;71:561-569.

8. Debbaneh M, Millsop JW, Bhatia BK, et al. Diet and psoriasis, part I: impact of weight loss interventions. J Am Acad Dermatol. 2014;71:133-140.

9. Bhatia BK, Millsop JW, Debbaneh M, et al. Diet and psoriasis, part II: celiac disease and role of a gluten-free diet. J Am Acad Dermatol. 2014;71:350-358.

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16. Helm MF, Farah JB, Carvalho M, et al. Compounded topical medications for diseases of the skin: a long tradition still relevant today. N Am J Med Sci. 2017;10:116-118.

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18. Helfrich YR, Sachs DL, Kang S. Topical vitamin D3. In: Wolverton SE, ed. Comprehensive Dermatologic Drug Therapy. 2nd ed. Philadelphia, PA: Saunders; 2007:691-695.

19. Lebwohl M, Siskin SB, Epinette W, et al. A multicenter trial of calcipotriene ointment and halobetasol ointment compared with either agent alone for the treatment of psoriasis. J Am Acad Dermatol. 1996;35:268-269.

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The condition exemplified by Patient A can typically be managed with topical products.

Topical steroids may be classified by different delivery vehicles, active ingredients, and potencies. The National Psoriasis Foundation's Topical Steroids Potency Chart can provide guidance (visit www.psoriasis.org/about-psoriasis/treatments/topicals/steroids/potency-chart and scroll down). Prescribing an appropriate amount is important; the standard 30-g prescription tube is generally required to cover the entire skin surface. Ointments have a greasy consistency (typically a petroleum base), which enhances potency and hydrates the skin. Creams and lotions are easier to rub on and spread. Gels are alcohol based and readily absorbed.¹⁶ Solutions, foams, and shampoos are particularly useful to treat psoriasis in hairy areas such as the scalp.

Corticosteroid potency ranges from Class I to Class VII, with the former being the most potent. While TCS products are typically effective with minimal systemic absorption, it is important to counsel patients on the risk of skin atrophy, impaired wound healing, and skin pigmentation changes with chronic use. With nail psoriasis, a potent topical steroid (including flurandrenolide [Cordran] tape) applied to the proximal nail fold has shown benefit.²⁰

Topical calcineurin inhibitors (TCIs; eg, tacrolimus ointment and pimecrolimus cream) are anti-inflammatory agents often used in conjunction with topical steroids to minimize steroid use and associated adverse effects.¹⁵ A possible steroid-sparing regimen includes using a TCI Monday through Friday and a topical steroid on the weekend.

Topical vitamin D analogs (calcipotriene, calcipotriol, calcitriol) inhibit proliferation of keratinocytes and decrease the production of inflammatory mediators.^15,17-19,21 Application of a vitamin D analog in combination with a high-potency TCS, systemic treatment, or phototherapy can provide greater efficacy, a more rapid onset of action, and less irritation than can the vitamin D analog used alone.²¹ If used in combination with UV light, apply topical vitamin D after the light therapy to prevent degradation.

Continue to: UV light therapy