Topical cannabinoids have shown benefit in the treatment of pruritus15 and may be beneficial for the treatment of PN, though there currently are limited data in the literature. With the use of both medical and legal recreational marijuana on the rise, there is an increased interest in cannabinoids, particularly as many patients consider these agents to be more “natural”—and therefore preferable—treatment options. As the use of cannabis derivatives become more commonplace in both traditional and complementary medicine, providers should be prepared to field questions from patients about their potential for PN.
Finally, the IL-31RA inhibitor nemolizumab also has shown promise in the treatment of PN. A recent study suggested that nemolizumab helps modulate inflammatory and neural signaling in PN.16 Nemolizumab has been granted breakthrough therapy designation for the treatment of pruritus in PN based on a phase 2 study that demonstrated improvement in pruritus and skin lesions in a group of 70 patients with moderate to severe PN.17 Nemolizumab, which is used to treat pruritus in atopic dermatitis, has minimal side effects including upper respiratory tract infections and peripheral edema.18
Final Thoughts
Prurigo nodularis historically has been considered difficult to treat, particularly in those with widespread lesions. Dupilumab—the first FDA-approved treatment of PN—is now an exciting option, not just for patients with underlying atopic dermatitis. Not all patients will respond to the medication, and the ease of obtaining insurance approval has yet to be established; therefore, having other treatment options will be imperative. In patients with recalcitrant disease, several other treatment options have shown promise in the treatment of PN; in particular, JAK inhibitors, alitretinoin, and nemolizumab should be considered in patients with widespread refractory PN who are willing to try alternative agents. Ongoing research should be focused on these medications as well as on the development of other novel treatments aimed at relieving affected patients.