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[Psoriasis as Koebner phenomenon in erythma migrans]
Summary
The Koebner phenomenon causes new skin lesions in psoriasis patients due to stimuli. A Borrelia infection triggered this phenomenon in a latent psoriasis case.
Area of Science:
- Dermatology
- Infectious Diseases
- Immunology
Background:
- The Koebner phenomenon describes isomorphic skin lesions appearing on healthy skin in patients with pre-existing dermatoses.
- Various stimuli, including mechanical, chemical, thermal, and infectious agents, can induce this phenomenon.
- Psoriasis is a chronic inflammatory skin condition characterized by well-demarcated erythematous plaques.
Observation:
- A 48-year-old woman presented with a migrating erythema.
- The erythema was diagnosed as being caused by Borrelia afzelii infection.
- The patient had a history of latent psoriasis.
Findings:
- The Borrelia afzelii infection acted as a trigger for the Koebner phenomenon.
- An exacerbation of the patient's latent psoriasis manifested as new skin lesions.
- Isomorphic lesions appeared in the uninvolved skin surrounding the erythema.
Implications:
- Infectious agents, such as Borrelia afzelii, should be considered as potential triggers for the Koebner phenomenon.
- This case highlights the importance of identifying underlying infections in patients presenting with atypical skin lesion exacerbations.
- Understanding the interplay between infection and autoimmune skin conditions like psoriasis can inform diagnostic and therapeutic strategies.