Print version ISSN 0365-0596
An. Bras. Dermatol. vol.87 no.6 Rio de Janeiro Nov./Dec. 2012
Risk factors for hidradenitis suppurativa: a pilot study*
Fatores de risco para hidradenite supurativa: um estudo piloto
Juliano Vilaverde SchmittI; Giovana BombonattoII; Manoela MartinIII; Hélio Amante MiotIV
IDermatologist - Preceptor of the dermatology service of the Hospital Universitário Evangélico de Curitiba - Faculdade Evangélica do Paraná (HUEC-FEPAR) - Curitiba (PR), Brazil
IIResident physician in internal medicine - Hospital Universitário Evangélico de Curitiba - Faculdade Evangélica do Paraná (HUEC-FEPAR) - Curitiba (PR), Brazil
IIITrainee physician - Fundação Pró-Hansen (FPH) - Curitiba (PR), Brazil
IVPhD Professor - PhD; assistant professor of the Dermatology and Radiotherapy Department of the Universidade Estadual Paulista "Julio de Mesquita Filho" (UNESP) - Botucatu (SP), Brazil
The hidradenitis suppurativa is a chronic debilitating inflammatory disease whose etiology is not fully understood. We conducted a pilot case-control study matched by sex and age with other dermatological patients to analyze possible risk factors associated with this disease. We included 15 cases and 45 controls, 67% were women. Bivariate and multivariate logistic regression analysis identified significant association with smoking, higher body mass index and family history. The use of hormonal contraceptives was less frequent in women with hidradenitis.
Keywords: Hidradenitis suppurativa; Obesity; Risk factors; Smoking
A hidradenite supurativa é uma doença inflamatória crônica debilitante de etiologia parcialmente compreendida. Realizamos um estudo piloto tipo caso-controle pareado por sexo e idade com outros pacientes dermatológicos para analisar prováveis fatores de risco associados a esta doença. Incluímos 15 casos e 45 controles, sendo 67% mulheres. Análise bivariada e multivariada por regressão logística identificou associação significativa com tabagismo, índice de massa corporal mais elevado e história familiar. O uso de contraceptivos hormonais foi menos frequente nas portadoras de hidradenite.
Palavras-chave: Fatores de risco; Hidradenite supurativa; Obesidade; Tabagismo
The hidradenitis suppurativa (HS) is a chronic inflammatory disease, with a recurrent character and difficult to treat. It is believed to result firstly from the occlusion of the hair follicle, followed by secondary infection of the apocrine glands.1-5
Women are about four times more affected than men, and, since apocrine glands only begin their secretory activity in puberty, the disease usually begins after that period, mainly affecting areas rich in glands such as the axillary regions, inguinal, perineal, intergluteal, perianal and inframammary. 1-5
Although its etiology is not fully elucidated, some risk factors have been described in the literature, albeit controversial. We emphasize obesity, use of hormonal contraceptives (HC), smoking and diabetes. We found no Brazilian studies that have evaluated these risk factors in our population, much less in a multivariate analysis or controlled by dermatology patients.6
We conducted a case-control study matched by sex and age in the proportion of one case to three controls. We interviewed patients with hidradenitis suppurativa treated between 2008 and 2009 at a public clinic of dermatology, according to a standardized questionnaire. Controls were selected from patients attended in the same institution with others dermatologic problems at the same period. Data were compared in a bivariate and multivariate conditional logistic regression. We considered significant p values <0.05.
We included 15 cases and 45 controls, 67% were women. The current average age was 32.3 ± 11.6 years, with an age at onset of 20.6 ± 12.3 years. Nine patients had lesions in the armpits and 9 had lesions in the groin or genital area. One had inframammary lesions. Ten reported active disease in the last two months and 5 had undergone surgical drainage or excision.
Six patients reported a similar condition in firstdegree relatives. Skin diseases more frequent in controls were dyschromia, acne, seborrheic dermatitis and leprosy.
In bivariate analysis, HS patients had higher smoking history, family history compatible with HS and higher BMI. Women with HS less frequently used HC (Table 1).
In multivariate analysis, we identified significant association with family history of HS, highest daily consumption of cigarettes and the interaction between body mass index (BMI) and age (Table 2). Among the cases there was a significant correlation between BMI and age at onset (Pearson R 2 = 0.65 / p <0.01).
Our data show age distribution, gender, and age at onset of the disease very similar to the literature. Likewise, the skin diseases present in the controls are compatible with the nosology of this age in our institution.4,5
The data reinforce the observations of other studies in terms of the association of HS with smoking and family history.7
Our data suggest a protective role of the use of HC. Similarly, recent work has verified the superiority of hormonal treatment when compared to other treatments such as antibiotics.8
Confirming previous studies, we identified elevated BMI as a risk factor for HS. However, in our data, BMI seemed to correlate with age at onset, suggesting that obesity should act as a risk factor especially among older patients. The association with obesity could be reflected in findings of insulin resistance, but the small sample size and the non performing of laboratory tests limited such observations.6
The family history of HS was a significant risk factor, as seen in several studies, some of which describe syndromic patterns with great genetic penetrance. However, we cannot rule out recall bias.9,10
Because this was a pilot study, this paper presents as the main limitation the small sample size. On the other hand, the pairing of the controls strengthens the results.
We conclude that the present study revealed risk factors previously reported in the literature regarding hidradenitis suppurativa, reinforcing the role of smoking, obesity and genetic susceptibility. The data suggest that regular use of HC could prevent the development or persistence of HS in women, but larger studies should be performed.
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Juliano Vilaverde Schmitt
Av. Sete de Setembro, 4713
80240-000 - Batel. Curitiba, PR
Received on 01.04.2012.
Approved by the Advisory Board and accepted for publication on 15.05.2012.
Conflict of interest: None
Financial funding: None
* Work performed at the Dermatology Service of the Hospital Universitário Evangélico de Curitiba - Faculdade Evangélica do Paraná (HUEC-FEPAR) - Curitiba (PR), Brazil.