Keywords: GVHD, graft versus host disease; HPV, human papilloma virus; SCC, squamous cell carcinoma; SCCIS, squamous cell carcinoma in situ; acute myelogenous leukemia; allo-SCT, allogeneic stem cell transplantation; allogeneic stem cell transplant; cGVHD, chronic graft versus host disease; cSCC, cutaneous squamous cell carcinoma; cutaneous; graft versus host disease; head and neck squamous cell carcinoma; human papilloma virus; immunodeficient; mucosal squamous cell carcinoma; squamous cell carcinoma; verruca vulgaris; warts.