Hi,
As a group of drugs known to inhibit the epidermal growth factor receptor(EGFR),ie,gefitinib,cetuximab,panitumumab,erlotinib(Taceva) and laptinib;Acneiform eruption is one of the side effects that is quite common(up to two-thirds of patients who receiving them.(although severe in only 5-10% )
But there is a consistent POSITIVE corelation between the severity of the acneiform rash and the antitumor activity.
Treatments include the use of topical benzoyl peroxide,retinoids and antibiotics. oral and topical diphenhydramine and other nonsedating agents for rash.
I hope the info. helps.