Bleomycin treatment for verrucae
Related Experiment Video
Updated: Jul 13, 2026

A Video Protocol of a Randomized Controlled Clinical Trial - Electrochemotherapy of Cutaneous Metastases with Reduced Dose Bleomycin (BLESS Trial)
Published on: June 9, 2026
1Department of Dermatology, University of California School of Medicine, San Francisco, CA, USA. nmp@pricen.net
Background:
The treatment of verrucae with bleomycin injections has not become a routinely adopted form of therapy in dermatologic practice since its use was originally described in 1980 because of the adverse effects and complications that have been associated with it.
Objectives:
The goal of this study was to demonstrate the results and the incidence of adverse effects from the use of bleomycin in clinical practice in a retrospective study of patients presenting with verrucae and to demonstrate the convenience and ease of the methodology that was used in obtaining these results.
Methods:
Patients' lesions were injected with bleomycin every 3 to 4 weeks until the lesions had been eliminated or the injections were discontinued because of adverse effects or complications.
Results:
There were 211 patients in the study, and 224 lesions were treated. After 1 treatment, 47.6% of the lesions were cleared; another 38.8%were cleared after 2 treatments; and another 9.8% were cleared after 3 treatments. In total, 96% of lesions were cleared after 5 treatments. A small number of temporary adverse effects were noted: 3 patients had local chemical cellulitis, 2 patients had formation of sterile abscesses, 1 patient had postinflammatory hyperpigmentation, and 1 patient had localized pain. No local or systemic complications were observed.
Conclusions:
Therapy with intralesional bleomycin is a relatively rapid and convenient form of therapy, compared with other available treatments, from the point of view of both the patient and the physician.
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