Phenytoin Allergy, also known as dilantin allergy, is related to exanthem and 1,4-phenylenediamine allergic contact dermatitis. An important gene associated with Phenytoin Allergy is TBXA2R (Thromboxane A2 Receptor), and among its related pathways/superpathways are Innate Immune System and Cytokine Signaling in Immune system. Related phenotypes are immune system and hematopoietic system