169 Poor validity of hidradenitis suppurativa diagnostic criteria in pediatric patients

Although HS commonly presents in adolescence, diagnostic criteria have not been validated children. This study aimed to determine the proportion of pediatric patients who met at time diagnosis. We conducted a single-center retrospective chart review identified by ICD-9/10 code from January 1, 2012–July 2021. collected data on demographics and fulfillment major criteria: (1) typical lesion, 2) location, 3) recurrence (>2 flares past 6 months)). present descriptive statistics as proportions fisher’s exact tests. 296 patient records were included study. The majority female (78.1%), Latinx (39.2%), Black (18.9%). Median age disease onset was 14 years (IQR 12-16 years). 55.1% (N=163) documented all three 96.0% (121/126) did meet failed criterion. 79.3% (96/121) criterion diagnosis had additional visit that examined for flare frequency. Additional lesions consistent with 68 patients. Of 28 ≥1 lesion before their visit, 10 within 6-month interval. With these data, actually fulfilled 58.4% (173/296) 40 after 33 (82.5%) 1-year period. Patients less likely ever received dermatology (34.1% vs 55.0% p < 0.001). Over 40% do criteria. Many experience longer interval, suggesting this may be too strict population.