Abstract Hidradenitis suppurativa (HS) is a chronic inflammatory debilitating condition that primarily affects younger people. Its exact prevalence is unknown, but it is estimated to affect at least 1% of the Irish and UK population. Onset is late adolescence and the early 20s in the majority. The impact of early-onset HS (< 18 years) is increasingly recognized, but awareness and knowledge of disease prevalence and severity in Ireland remain sparse. Studies in adults highlight association with a raised body mass index (BMI) and smoking, in addition to an increased prevalence in young females with African American or mixed ancestry. Presently, there is an absence of specific guidelines for management in those aged < 18 years. With rising obesity levels, combined with decreasing pubertal age, we may encounter early-onset HS more often in future. We present a snapshot of patients with HS attending a single paediatric hospital who were considered for systemic therapy. Ten patients were included (eight females). Mean (SD) age of symptom onset was 12.4 (1.9) years, mean (SD) age of presentation was 14 (2.1) and mean duration of symptoms prior to presentation was 1.5 years. Nine received systemic therapy (nine antibiotics and four biologics). Disease severity, defined by Hurley stage, was mild in one, moderate in five and severe in four. All patients had achieved puberty, one was defined as early-onset (age 10 years) and another as precocious (age 9 years). The BMIs varied: one was normal, two were above a healthy weight, five were very overweight and three were severely overweight according to UK centiles. Most patients experienced comorbidities, including, but not limited to, Crohn disease (n = 1), hepatic steatosis (n = 2), pilonidal sinus (n = 3) and acne (n = 5). One had diabetes, two impaired fasting glucose and one hypercholesterolaemia. No patient reported smoking. Passive smoking and blood pressure were not documented. Four patients had positive family histories. Six patients identified as Black Irish (one Irish Caribbean and five Irish Nigerian), two were White Irish, one patient was from India and one was from Poland. We describe a group of individuals aged ≤ 16 years, the majority of whom had moderate–severe HS. They had similar comorbidities to internationally reported literature in early-onset HS. More skin of colour ethnicities are represented than seen in the general Irish population, which probably reflects both the catchment area and severity of the skin conditions experienced. The limitations of our study include under-representation of milder disease due to an inability to perform a full cross-sectional study at present. Further prospective studies are required to capture the prevalence and characteristics of HS fully in our population of children and young adults. Considering the lifetime impact of this condition, guidelines for the management of HS under the age of 18 years should be considered.
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