Most nettle agents, such as the best known and studied nettle agent, phosgene oxime, are often grouped with the vesicant (blister agent) chemical agents. However, because nettle agents do not cause blisters, they are not true vesicants.[2]
References
^Smith, Kathleen J.; Skelton, Henry (July–August 2003). "Chemical Warfare Agents: Their Past and Continuing Threat and Evolving Therapies Part I of II". SKINmed: Dermatology for the Clinician. 2 (4): 215–222. doi:10.1111/j.1540-9740.2003.02509.x. PMID14673274.