Pain Perception: Lidocaine Rate/Temp/Buffer

Inclusion Criteria: * Subjects who are undergoing dermatologic procedures. * Subjects ages 18-89 year old. * The subjects have the willingness and the ability to understand and provide informed consent and communicate with the investigator. Exclusion Criteria: * Subjects who are allergic to lidocaine. * History of bleeding tendency or coagulopathy. * Pregnant or lactating. * Active skin disease or skin infection in the treatment area. * Unable to understand the protocol or give informed consent. * Any other condition, in the professional opinion of the investigator, that would potentially affect response or participation in the clinical study, or would pose as an unacceptable risk to the subject.