Several cancer types are treated with epidermal growth factor receptor (EGFR)-targeting agents (EGFR inhibitors), but this treatment is associated with dermal toxicity in up to 90% of cases, where 80% of cases have rash, among other issues. This skin toxicity is mainly driven by elevation of Staphylococcus aureus and the proinflammatory cytokine IL-36γ. Skin keratinocytes’ cutaneous immune defense is impaired by EGFR inhibitors.