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Ten-year follow-up study of linear immunoglobulin A dermatosis complicated with ulcerative colitis. Linear immunoglobulin A dermatosis (LAD) is rarely complicated in patients with ulcerative colitis (UC), though the long-term prognosis in those with concurrent LAD and UC is not fully understood. Here, we report findings obtained in follow-up examinations performed over a 10-year period of a UC patient initially complicated with LAD. We treated an 18-year-old male for relapse of UC with deteriorating blisters diagnosed as LAD. Following successful induction therapy for both UC and LAD with oral prednisolone, the patient was followed for 10 years. Skin condition remained good at each examination, even with second and third relapses of UC. Our findings in this case indicate that LAD is rarely complicated with UC, while it has no association with colitis disease activity. Furthermore, adequate treatment following an initial diagnosis of LAD is important for management of affected UC patients.