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When eczema isn’t eczema: Unmasking mycosis fungoides in an elderly patient through the lens of immunosenescence
Abstract
Erythroderma is a severe dermatological manifestation referring to diffuse erythema and scaling involving ≥90% of the body surface area. The underlying etiology ranges widely, including psoriasis, atopic dermatitis, contact dermatitis, drugs, and malignancy. Up to 30% of the eryhtroderma cases are idiopathic. However, the underlying etiology of some of the idiopathic cases might be identified during the follow-up period by obtaining serial biopsies. Mycosis fungoides (MF) is the most common subtype of cutaneous T-cell lymphoma, accounting for almost 40% of the cutaneous lymphomas. MF can mimic many dermatoses by various presentations, making its diagnosis challenging. Rarely, it can present with eryhtroderma.
Here, we present a 62-year-old male patient presenting with 6-month-long chronic desquamating plaques predilecting for flexural areas, trunk, neck, and hairy scalp. He had high total serum IgE and leonine-like facial features. He had no known skin disease; his medical history for atopy and malignancy was unremarkable. His initial histopathology report revealed adult-onset atopic dermatitis (AD), and he was treated accordingly. However, considering the lack of AD history and the fast recurrence of the lesions lead we re-biopsied the lesions. The second biopsy revealed mycosis fungoides.
It is paramount not to disregard other possible causes of senile erythroderma in patients presenting with common features of atopic dermatitis, especially in the elderly without a history of atopic dermatitis, since they are not solely specific to AD. Immunesenesence and relative Th2 dominance observed as aging might explain the idiopathic eryhtroderma seen most frequently in elderly patients with no history of skin diseases. In addition to contributing to the AD-like clinic, it might also signal future risk for the development of MF, so close follow-up with serial biopsies is crucial.
Keywords
Supporting Institution
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Ethical Statement
This study was conducted in accordance with the ethical standards of the institutional and national research committees and with the 1964 Declaration of Helsinki and its later amendments (revised 2013). Written informed consent was obtained from the patient for participation in the study and for the publication of clinical data and images. The authors affirm that patient anonymity has been preserved and that all ethical principles for human research were followed throughout the study.
Thanks
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References
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- Guglielmo A, Patrizi A, Bardazzi F, Pileri A. Erythroderma: psoriasis or lymphoma? A diagnostic challenge and therapeutic pitfall. Ital J Dermatol Venereol. 2022;157(2):154-7. doi:10.23736/S2784-8671.21.06891-7.
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Details
Primary Language
English
Subjects
Dermatology
Journal Section
Case Report
Publication Date
April 1, 2026
Submission Date
October 28, 2025
Acceptance Date
March 31, 2026
Published in Issue
Year 2026 Volume: 43 Number: 1
APA
Altınbaş, E., Tetik Aydoğdu, C., Demir Pektaş, S., Alataş, E. T., & Bat, B. (2026). When eczema isn’t eczema: Unmasking mycosis fungoides in an elderly patient through the lens of immunosenescence. Deneysel Ve Klinik Tıp Dergisi, 43(1), 113-117. https://izlik.org/JA82NL82JR
AMA
1.Altınbaş E, Tetik Aydoğdu C, Demir Pektaş S, Alataş ET, Bat B. When eczema isn’t eczema: Unmasking mycosis fungoides in an elderly patient through the lens of immunosenescence. J. Exp. Clin. Med. 2026;43(1):113-117. https://izlik.org/JA82NL82JR
Chicago
Altınbaş, Ekin, Ceyda Tetik Aydoğdu, Suzan Demir Pektaş, Emine Tuğba Alataş, and Barış Bat. 2026. “When Eczema Isn’t Eczema: Unmasking Mycosis Fungoides in an Elderly Patient through the Lens of Immunosenescence”. Deneysel Ve Klinik Tıp Dergisi 43 (1): 113-17. https://izlik.org/JA82NL82JR.
EndNote
Altınbaş E, Tetik Aydoğdu C, Demir Pektaş S, Alataş ET, Bat B (April 1, 2026) When eczema isn’t eczema: Unmasking mycosis fungoides in an elderly patient through the lens of immunosenescence. Deneysel ve Klinik Tıp Dergisi 43 1 113–117.
IEEE
[1]E. Altınbaş, C. Tetik Aydoğdu, S. Demir Pektaş, E. T. Alataş, and B. Bat, “When eczema isn’t eczema: Unmasking mycosis fungoides in an elderly patient through the lens of immunosenescence”, J. Exp. Clin. Med., vol. 43, no. 1, pp. 113–117, Apr. 2026, [Online]. Available: https://izlik.org/JA82NL82JR
ISNAD
Altınbaş, Ekin - Tetik Aydoğdu, Ceyda - Demir Pektaş, Suzan - Alataş, Emine Tuğba - Bat, Barış. “When Eczema Isn’t Eczema: Unmasking Mycosis Fungoides in an Elderly Patient through the Lens of Immunosenescence”. Deneysel ve Klinik Tıp Dergisi 43/1 (April 1, 2026): 113-117. https://izlik.org/JA82NL82JR.
JAMA
1.Altınbaş E, Tetik Aydoğdu C, Demir Pektaş S, Alataş ET, Bat B. When eczema isn’t eczema: Unmasking mycosis fungoides in an elderly patient through the lens of immunosenescence. J. Exp. Clin. Med. 2026;43:113–117.
MLA
Altınbaş, Ekin, et al. “When Eczema Isn’t Eczema: Unmasking Mycosis Fungoides in an Elderly Patient through the Lens of Immunosenescence”. Deneysel Ve Klinik Tıp Dergisi, vol. 43, no. 1, Apr. 2026, pp. 113-7, https://izlik.org/JA82NL82JR.
Vancouver
1.Ekin Altınbaş, Ceyda Tetik Aydoğdu, Suzan Demir Pektaş, Emine Tuğba Alataş, Barış Bat. When eczema isn’t eczema: Unmasking mycosis fungoides in an elderly patient through the lens of immunosenescence. J. Exp. Clin. Med. [Internet]. 2026 Apr. 1;43(1):113-7. Available from: https://izlik.org/JA82NL82JR
