Original ResearchPublished 23 February 2026The epidemiological and clinical association between primary focal hyperhidrosis and various skin disease in Japanese patients: outpatient questionnaire analysisKeiji Kosaka · Akihiko Uchiyama · Mai Ishikawa · Sei-Ichiro MotegiJournal of Cutaneous Immunology and Allergydoi 10.3389/jcia.2026.15800