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Papular Pityriasis Rosea Continuing Medical Education Papular Pityriasis Rosea 2nd Lt Ronald M. Bernardin, MSC, USAF; Maj Steven E. Ritter, MC, FS, USAF; Lt Col Michael R. Murchland, MC, FS, USAF GOAL To describe a case of papular pityriasis rosea (PR) OBJECTIVES Upon completion of this activity, dermatologists and general practitioners should be able to: 1. Outline the varying clinical presentations of PR. 2. Discuss the theoretical etiologies of PR. 3. Describe therapy for PR. CME Test on page 48. This article has been peer reviewed and Medicine is accredited by the ACCME to provide approved by Michael Fisher, MD, Professor of continuing medical education for physicians. Medicine, Albert Einstein College of Medicine. Albert Einstein College of Medicine designates Review date: June 2002. this educational activity for a maximum of 1.0 hour This activity has been planned and implemented in category 1 credit toward the AMA Physician’s in accordance with the Essential Areas and Policies Recognition Award. Each physician should claim of the Accreditation Council for Continuing Medical only those hours of credit that he/she actually spent Education through the joint sponsorship of Albert in the educational activity. Einstein College of Medicine and Quadrant This activity has been planned and produced in HealthCom, Inc. The Albert Einstein College of accordance with ACCME Essentials. Pityriasis rosea (PR) is a seasonal papulosqua- and treatment options. Papular PR is atypical, pre- mous disorder that can be easily confused with a senting in a minority of patients, and may pose a wide variety of similar appearing cutaneous disor- diagnostic challenge. Being familiar with these ders. This is particularly evident in its atypical atypical characteristics will facilitate accurate and papular form. We present a case report of atypical timely diagnosis. papular PR, along with a discussion of clinical pre- sentation, histologic criteria, proposed etiology, ityriasis rosea (PR) is an acute, self-limited, inflammatory disorder that primarily affects children and young adults. It is characterized Dr. Bernardin is a transitional intern at David Grant Medical P Center, Travis Air Force Base, Fairfield, California. Dr. Ritter is a by a distinctive papulosquamous skin eruption clas- Dermatology Resident at Wilford Hall Medical Center, Lackland sically distributed on the trunk and proximal Air Force Base, San Antonio, Texas. Dr. Murchland is a Chief extremities. PR has been described in the medical Dermatopathologist with the Teaching Faculty in the Department literature for more than 200 years, though the der- of Dermatology and Pathology at San Antonio Uniformed Services Health Education Consortium. matosis was first called pityriasis rosea, literally The views expressed are those of the authors and are not to be “rose-colored scale,” by the esteemed French physi- construed as official or as reflecting those of the US Air Force cian Camille Gilbert in 1860.1 A condition seen Medical Service or the US Department of Defense. This work is in throughout the world, PR may occur in patients of the public domain. The authors report no conflicts of interest. all ages; however, approximately 75% of cases Reprints: Lt Col Michael R. Murchland, MC, FS, USAF, Department 2 of Dermatology, Wilford Hall Medical Center, 2200 Berquist Dr, occur between the ages of 10 and 35 years. While Suite 1, Lackland Air Force Base, San Antonio, TX 78236-5300 there exists a slight female predominance, no racial (e-mail: [email protected]). predisposition has been noted. The disease is more VOLUME 70, JULY 2002 51 Papular Pityriasis Rosea Figure 1. Papulosquamous truncal dermatitis with herald patch. Figure 2. Focal spongiosis, parakeratosis, and extrava- sated red blood cells (H&E, original magnification ϫ200). common in the fall and winter and during the skin revealed focal spongiosis, parakeratosis, and spring months in temperate climates. extravasation of red blood cells (Figure 2). Case Report Clinical Presentation A 36-year-old African American man presented to The clinical findings of PR are remarkably consis- the dermatology clinic with a 1-week history of a tent in most patients. The initial manifestation is pruritic papulosquamous rash all over his back, the herald patch (a solitary, erythematous, oval chest, and neck (Figure 1). Antihistamines pro- plaque that gradually enlarges for 1 to 2 days, ranges vided only minimal relief. He reported no from 2 to 6 cm in diameter, and is found most antecedent illness or recent use of medication. commonly on the anterior aspect of the chest). The Results of a potassium hydroxide (KOH) prepara- reported prevalence of the herald patch varies tion were negative for hyphae. A biopsy of the widely from series to series but typically occurs in 52 CUTIS® Papular Pityriasis Rosea Figure 3. Grouped 2- and 3-mm scaly papules on the back. 50% to 90% of cases.3 A generalized eruption con- patch may be mistaken for tinea corporis. A KOH sisting of crops of salmon-colored, 5- to 10-mm preparation of skin scrapings is utilized to make this ovoid macules and papules follows the appearance of distinction. Nummular eczema and nummular the herald patch, normally within 7 to 14 days. The asteatosis also may be considered. When the gener- characteristic lesions are covered with a delicate alized eruption of PR occurs, cutaneous processes, collarette of scale at their margins and arranged with such as secondary syphilis, tinea versicolor, psoriasis their longest axis parallel to the lines of cleavage, or parapsoriasis guttata, and seborrheic dermatitis, forming the so-called Christmas-tree pattern on the should be included in the differential diagnosis. The trunk and proximal aspect of the extremities. Usu- lesions of erythema dyschromicum perstans, irritated ally, the hands and feet are spared. The eruption pityriasis alba, and pityriasis lichenoides chronica, classically persists for 2 to 12 weeks, though pro- which can follow the lines of skin cleavage on the longed cases of up to 5 months have been reported.1 trunk, also must be differentiated from PR. Rare Atypical disease occurs in 10% to 15% of cases of purpuric PR may be confused with Kaposi patients and may pose a diagnostic challenge.4 Our sarcoma, vasculitis, Henoch-Schönlein purpura, or patient presented with papular PR, a rare form of various causes of thrombocytopenia.1 In vesicular the disorder that is more common in young children, PR, the possibility of varicella must be considered. pregnant women, and Afro-Caribbeans (Figure 3).5 A number of medications have been associated Scabies, lichen planus, and a lichenoid drug reac- with a PR-like dermatosis. These include captopril, tion may have similar appearances and occasion- isotretinoin, metronidazole, D-penicillamine, levami- ally are confused with papular PR. Patients with sole, gold, bismuth, arsenic, barbiturates, and cloni- this morphologic type more likely exhibit features dine.6 Vaccines, such as bacillus Calmette-Guérin of inverse PR, another unusual variant that is char- and diphtheria toxoid, also have been reported acterized by involvement of usually spared areas, to cause similar eruptions.1 The lesions found in such as the face, axilla, and groin. Inverse papular drug-induced PR may exhibit classical features; PR may mimic papular acrodermatitis of childhood however, they tend to be recalcitrant to therapy (Gianotti-Crosti syndrome). The most common and have a prolonged course. In addition, they are atypical manifestation is the absence of a herald usually less numerous, larger in diameter, and more patch.4 Urticaria, vesicles, bullae, lichenoid lesions, commonly lead to marked hyperpigmentation than nonpalpable purpura, erythema multiforme–like the typical lesions. Frequently, the Christmas-tree lesions, gigantic plaques, and exfoliative dermatitis distribution is absent.6 all have been reported.6 Although PR is recognized easily in its classic Diagnosis presentation, difficult cases are encountered some- Because the diagnosis of PR usually is made by the times. Early in the course of the disease, the herald clinical appearance of the eruption, a biopsy of the VOLUME 70, JULY 2002 53 Papular Pityriasis Rosea skin is rarely necessary. Histopathologic findings are make any definitive statements regarding the etiol- relatively nonspecific and represent those of a sub- ogy, infectious or otherwise, of PR. acute or chronic dermatitis. Typically, an undulat- ing epidermis is seen with focal parakeratosis, as Comment well as a diminished granular layer and spongiosis. The imperfect understanding of PR is reflected by Small spongiotic vesicles, sometimes mimicking the numerous modes of therapy used in the past. Pautrier microabscesses because of the collection of These have consisted of injections with arsenic and lymphocytes within them, are a characteristic fea- bismuth, staphylococcal toxoid, streptococcal and ture.7 The papillary dermis shows some edema and typhoid vaccines, milk, and PR scales dissolved in occasionally homogenization of collagen, along saline solution.6 Because the lesions disappear with a mild-to-moderate lymphohistiocytic perivas- spontaneously within a limited time frame, treat- cular infiltrate. Older lesions may exhibit a relative ment usually is aimed at relieving pruritus, which increase in the number of eosinophils in this infil- may be severe in approximately 25% of patients.3 trate. The herald patch demonstrates the standard Therapy includes emollients, corticosteroid creams, features of a secondary
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