Epidermal growth factor receptor inhibitors (EGFRI) such as cetuximab are used to treat unresectable or metastatic cutaneous squamous cell carcinoma.1 Cetuximab causes a painful and pruritic papulopustular eruption in over 80% of patients.2 Antibiotics like tetracyclines are commonly prescribed for acneiform eruptions owing to their anti-inflammatory and antimicrobial effects.3 Even with antibiotics, many patients experience an acneiform eruption that limits EGFRI therapy. Recent literature has shown an association between Demodex mites and inflammatory skin conditions, such as rosacea and EGFRI-induced eruptions.2,4,5 Ivermectin is one available treatment for demodicosis.5 We report the case of a man taking cetuximab with a tetracycline-resistant acneiform eruption successfully treated with oral ivermectin.
Parker TB, Blechman AB, Wilson BB. Demodex-Positive Acneiform Eruption Responsive to Ivermectin in a Patient Taking an Epidermal Growth Factor Inhibitor. JAMA Dermatol. 2017;153(9):939–940. doi:10.1001/jamadermatol.2017.0803
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