Related Experiment Video
Updated: Mar 1, 2026

Saline Lavage for Sampling of the Canine Nasal Immune Microenvironment
Published on: December 27, 2024
Borrelial pseudolymphoma of the nose
Mosab Tariq Mohanna1, Jivko Kamarashev1, Günther F L Hofbauer1
1Department of Dermatology, University Hospital Zurich, Zurich, Switzerland.
Abstract:
A 52-year-old Colombian woman, a patient with psoriasis, undergoing phototherapy with (ultraviolet B narrowband) UVBnb, presented with a symptomless solitary diffuse erythaematous plaque on her nose for 3 months. Initially, she was treated with pimecrolimus 1% cream for 8 weeks, which was then combined with metronidazole cream for 4 weeks, with the initial diagnosis of UV-triggered rosacea, without improvement. A punch biopsy was performed and the histology showed a pseudolymphomatous reaction. The diagnosis of nasal pseudolymphoma of borreliosis was confirmed with PCR. The lesion completely resolved following oral doxycycline therapy.
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