Lichenoid drug reactions: identification and management

Lichenoid drug reactions (LDRs) clinically resemble lichen planus but they cannot be confidently distinguished from one another by histopathology. While there is often a temporal relationship between starting medication and symptom onset, this can vary from weeks to years. Many medications are known to cause LDRs. Recognition of a possible medication-induced reaction and prompt referral to secondary care are essential for timely management of what can be a debilitating condition. The case of an LDR in a patient who recently completed chemotherapy is described. CPD/Clinical Relevance: Dental professionals should be aware of oral lichenoid reactions and when to refer patients onwards.