the etiology of folliculitis is complex and in a given case several factors may contribute including infection , physical irritation , occlusion , other skin diseases and drugs . among drugs ,
however , the role of the native glucocorticoid , cortisol , as a regulator / dampener of potential inflammatory reactions in the hair follicles is unknown .
here we report a case of treatment - resistant folliculitis which resolved after recognition and treatment of low cortisol due to adrenal insufficiency .
a 40-year - old man was admitted to our clinic with folliculitis which he had suffered from for at least 2 years . besides genital condyloma
he had a medical history of psychological problems , tiredness , low libido and lower back pain .
as a supplement to body building , he had used anabolic steroids a short period of time more than 15 years before the debut of folliculitis .
three years before the debut of folliculitis , he was involved in a traffic injury , accelerating all his symptoms .
this led to an abuse of cocaine and amphetamine for 4 years , whereafter he was diagnosed with attention deficit and hyperactivity disorder and treated with methylphenidate . at this time
clinically , he presented a superficial folliculitis with inflamed red hair follicles with surface pustules .
the skin changes were found on the scalp , face , upper trunk , thighs and pubic area . at first ,
the patient was treated with long - term courses ( up to 6 months ) of oral tetracycline supplemented with regimes of topical antifungals ( ketoconazole shampoo 2% ) and , on separate occasions , short regimes of topical glucocorticoid ( hydrocortisone-17-butyrate and betamethasone with clioquinol , respectively ) .
all initiated treatments were found to be remarkably insufficient in this patient with little or no effect on clinical findings .
a skin biopsy from the back of the upper trunk was performed which showed suppurative folliculitis , primarily involving the infundibular portions of the hair follicle .
periodic acid - schiff stain revealed numerous oval yeast - like organisms , thus compatible with malassezia furfur folliculitis ( fig 1 , fig 2 ) .
systemic antifungal treatment included itraconazole 100 mg per day for 2 weeks with no clinical response .
treatment with fluconazole , at first 150 mg every week for 8 weeks , followed by 300 mg every week for 8 weeks , showed some response , but with persisting folliculitis in the beard area .
courses of systemic glucocorticoids given by the patient 's general practitioner allegedly showed good effect . however , such treatment was tapered or discontinued at the follow - ups in our clinic .
two years after admission to our clinic , the patient was admitted to the department of endocrinology , odense university hospital , odense , denmark .
blood tests showed low testosterone ( 3.8 nmol / l ) , low testosterone / sex hormone - binding globulin ( 0.09 ) and low luteinizing hormone ( 0.6 ui / l ) compatible with hypogonadotropic hypogonadism .
also the cortisol level was low ( spot cortisol 74 nmol / l ) , with adrenocorticotropic hormone being low in the normal reference interval .
several factors were suspected to have caused suppression of the pituitary gland ( use of amphetamine / cocaine , anabolic steroids , traffic injury , and use of morphine ) and therefore the exact time of onset could not be said . at first
, he was given testosterone for 1.5 months without any observable effect on his skin symptoms . however , when he received both testosterone and hydrocortisone his folliculitis resolved completely in less than a month , and still after 2 years there has been no severe relapse ( fig 3 ) .
pituitary insufficiency can cause isolated or multiple affection of hormonal production . in this patient , both the level of testosterone and cortisol was low .
normalizing the level of testosterone did not have any effect on his skin , but shortly after hydrocortisone substitution his folliculitis resolved .
it is well known that acneiform eruptions can be side effects to both systemic and strong topical glucocorticoid treatment .
systemic glucocorticoid suppresses the hypothalamus - pituitary - adrenal ( hpa ) axis resulting in a reduction in endogenous cortisol production and thereby low circulating cortisol level .
topical glucocorticoid also suppresses the hpa axis , although at a physiological level , and only pathologically when exceeding accepted safety guidelines . to our knowledge
, it is unknown whether the low level of endogenous cortisol plays a role in the pathogenesis of acneiform eruptions during glucocorticoid treatment besides the possible direct effect of the glucocorticoid drug .
studies on the direct effect of topical glucocorticoids on the development of acneiform eruptions suggest that acne is provoked by inducing rupture of the follicle where sebum seeps into the dermis .
also keratinization and suppuration of follicular epithelium has been suggested as pathogenesis of glucocorticoid - induced acneiform eruptions .
however , these studies are few and it remains unclear whether the previously described physiological suppression of the hpa axis is involved in the pathogenesis of topical glucocorticoid - induced acneiform eruptions .
in conclusion , this case report suggests that low levels of cortisol may play a role as modifier of the inflammatory component of folliculitis and thus the pathogenesis of at least certain types of folliculitis .
the authors report no conflicts of interest . there was no funding of this work .
 a report on a 40-year - old patient with recalcitrant , suppurative folliculitis is presented . 
 after years of unsuccessful treatment with conventional therapies , the patient was diagnosed with adrenal insufficiency with a low level of circulating cortisol . 
 a few weeks after the patient was subjected to substitution therapy with hydrocortisone , his folliculitis resolved . 
 we discuss the role of plasma cortisol level in the pathogenesis of folliculitis . 
Introduction
Case Report
Discussion
Conclusion
Statement of Ethics
Disclosure Statement