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Central centrifugal cicatricial alopecia: Superimposed tinea capitis as the etiology of chronic scalp pruritus

  • Author(s): Chiang, Charles;
  • Price, Vera;
  • Mirmirani, Paradi
  • et al.
Main Content

Central centrifugal cicatricial alopecia: Superimposed tinea capitis as the etiology of chronic scalp pruritus
Charles Chiang MD1, Vera Price MD1, Paradi Mirmirani MD2
Dermatology Online Journal 14 (11): 3

1. Department of Dermatology, University of California San Francisco, San Francisco, CA. chiangc@derm.ucsf.edu
2. Department of Dermatology, University of California San Francisco, San Francisco, CA. Department of Dermatology, Case Western Reserve University, Cleveland, OH. Department of Dermatology, The Permanente Medical Group, Vallejo, CA.


Abstract

We discuss a patient with central centrifugal cicatricial alopecia (CCCA) who developed severe scalp pruritus that was initially attributed to the cicatricial alopecia and ultimately diagnosed as tinea capitis. The rarity of severe pruritus in CCCA should prompt a search for a fungal infection in these patients.



Case description

A 63-year-old African American woman with a known, biopsy-proven diagnosis of CCCA (Fig. 1), presented with severe scalp itching of 2 months duration. In the past, her itching had been mild and easily controlled with antiseborrheic shampoos. Her past medical history included rheumatoid arthritis for which she was taking prednisone 5mg orally daily and methotrexate 15mg orally weekly. On physical examination, there was a 6cm patch of scarring alopecia at the scalp vertex which radiated centrifugally to the frontal and temporal scalp. Along the frontal scalp the patient also had decreased hair density and mild perifollicular scale (Fig. 2). The patient's symptoms and physical findings were attributed to a flare of CCCA. Her topical treatments included fluocinolone oil daily, clobetasol solution daily, and intralesional triamcinolone; her systemic medications were changed from hydroxychloroquine to minocycline 100mg daily. On a follow-up visit 6 weeks later, the appearance of her scalp was improved. However, her severe pruritus persisted.


Figure 1Figure 2

On examination of the body, an erythematous papule was present on the left forearm. A punch biopsy was performed and was positive for fungi (Fig. 3). A scalp fungal culture grew Trichophyton tonsurans.


Figure 3

The patient was treated with a six week course of griseofulvin 250mg by mouth twice daily and topical terbinafine twice daily on the scalp and arm. A repeat scalp fungal culture at the end of the six week course was negative and the patient's pruritus had resolved.


Discussion

Tinea capitis (TC) is a common infection in the United States with the predominant fungal organism being Trichophyton tonsurans [1, 2, 3, 4]. Although most common in children aged 3 to 7 years, TC can occur at any age from the neonate [5, 6] to the elderly [7, 8] and the increasing incidence in adults ranges from 2.7 percent to 11.4 percent of reported cases [3, 9, 10, 11, 12, 13]. However, low clinical suspicion combined with the varied clinical manifestations of tinea capitis caused by T. tonsurans can lead to under-recognition of the problem in adults. At times, pruritus and mild scaling may be the only clinical manifestation of disease, such as seen in this patient. Interestingly, it has been suggested that asymptomatic or minimally symptomatic carrier adults may act as a reservoir of disease in households of children with TC, underscoring the importance of a heightened awareness of TC in adults [14]. At-risk adults may be difficult to identify since there is a complex and changing relationship between the host and dermatophyte that ultimately determines susceptibility and infection [15, 16]. Host factors predisposing to infection include the presence of a broad-based immune dysregulation such HIV infection and a defective epidermal barrier [17, 18, 19, 20]. Whether chronic immunosuppression due to medications (chemotherapy, prednisone) increases the host's risk of infection is debatable [17, 18, 19, 20]. Patients with rheumatoid arthritis have been noted to have a higher likelihood of dermatophyte infection compared to a control group even after adjusting for immunosuppressive medications suggesting an inherent host susceptibility [21]. Increased rates of TC infection in black patients has also been documented, but to date, the reason for this observation is unclear as a case-controlled study showed that acquisition of TC was unrelated to specific hair care practices such as use of hair oils, frequency of washing, or tight braiding [22].

In primary cicatricial alopecia, there is an inflammatory assault directed primarily at the follicular unit. Although the antigentic trigger for this inflammation is unclear, there is eventually loss of the sebaceous glands and follicular stem cells leading to permanent hair loss. Aside from the cutaneous manifestations, there is no evidence of systemic immune dysregulation or increased susceptibility to infection. Central centrifugal cicatricial alopecia (CCCA) [23] is a subtype of primary cicatricial alopecia usually occurring in middle-aged African American females. Unlike other subtypes of cicatricial alopecia, patients seldom report pruritus. Furthermore, perifollicular scale is mild or absent in CCCA even when there is perifollicular inflammation on histology [24]. Although patients with cicatricial alopecia are not considered to have an increased risk of dermatophyte infection, this case highlights the fact that other host features, including immunosuppressive medications used for treatment of cicatricial alopecia or other co-existing disorders, may predispose to TC. Given the subtle or atypical manifestations of TC in adults and epidemic levels of TC in the United States, a fungal culture should be an integral part of the evaluation of CCCA, especially when there is the presence of localized scaling or pruritus. Furthermore, this case illustrates the importance of questioning working diagnoses when a patient fails to respond to therapy.

Tinea capitis requires systemic treatment [25]. Griseofulvin is most commonly utilized due to its cost-effectiveness although treatment failures have become more common and the dose required for effective treatment has been increasing [26, 27, 28, 29]. It is unclear whether there is emerging fungal resistance to griseofulvin or whether poor adherance to a 6-8 week course leads to failure of treatment. Newer antifungal agents including itraconazole, fluconazole, and terbinafine are similar in efficacy to griseofulvin, are safe, and may decrease the rate of recurrence [26, 27, 30]. Topical 2 percent ketoconazole and 1 percent selenium sulfide shampoos and topical antifungal creams can be considered as adjunctive treatment [31, 32, 33].

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