DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Drug allergy. Oral ulcers as a result of a drug reaction to phenytoin, an anticonvulsant drug used as a long-term treatment for epilepsy and to treat trigeminal neuralgia. It is always difficult to distinguish between a rash caused by a drug or other factors such as a food allergy. The best way to tackle a suspected drug reaction is to stop the use of all drugs till a certain diagnosis is made.
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