Letter to the EditorPublished 7 January 2026Cicatricial alopecia of the scalp as a manifestation of IgG4-related disease mimicking acne keloidalis nuchaeAyame Suwayama · Tomoko Kaminaga · Shujiro Hayashi · Shown Tokoro · Ken IgawaJournal of Cutaneous Immunology and Allergydoi 10.3389/jcia.2025.15953