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EGFR inhibitors are a class of targeted therapy used to treat several cancers, including colorectal cancer. 

About 80% of patients who receive them will also develop an acne-like rash as a side effect. Sometimes, this rash can be quite severe. If not controlled adequately, it may force patients to stop taking the EGFR inhibitor entirely and explore other treatment options.  

But why does this skin-related...