Abstract: The invention provides a method of treating and/or preventing a toxicity associated with epidermal growth factor receptor (EGFR) inhibitor therapy in a subject, the method comprising administering to the subject an effective amount of a steroid sulfatase (STS) inhibitor. The toxicity may be ocular toxicity; or dermatologic toxicity, such as papulopustular rash. The EGFR inhibitor may be selected from the group consisting of: a small molecule; an antibody or derivative or fragment thereof; another agent that targets the extracellular or intracellular domain of the EGFR, such as a tyrosine kinase inhibitor selected from the group consisting of: erlotinib; gefitinib; lapatinib; and any combination thereof. The EGFR inhibitor may also be antibody selected from the group consisting of: cetuximab; panitumumab; and any combination thereof.