RecruitingEarly Phase 1Biological interventionA Phase 0 Window of Opportunity Trial of Intratumoral Seasonal Influenza Immunization in Cutaneous Squamous Cell Carcinoma (CSCC) Patients Awaiting Curative ExcisionThis study is investigating the effects on immune cells of injecting the influenza vaccine (also known as "flu shot") into cutaneous squamous cell carcinoma (CSCC) tumors prior to having standard-of-care Mohs excision surgery. The study will help understand if the addition of the influenza vaccine could improve the immune system response against the cancer. The names of the study drug involved in this study is: -Fluzone Influenza vaccine (flu shot)