Abstract Hypersensitivity pneumonitis (HP) and eosinophilic esophagitis represent two different entities of allergic response to an inhaled/ingested allergen in susceptible individuals, characterized by lymphocytic and eosinophilic infiltration of the tissue, respectively. Various antigenic stimuli have been reported as the offending agent in previous case reports, of which hair dye is noted as one of the rarest causative agents responsible for both HP and eosinophilic esophagitis. Thorough history taking and identification of the exposure play a crucial role in the diagnosis of HP. Simultaneous development of HP and eosinophilic esophagitis in a patient with a significant exposure history is seldom reported in previous studies. Here, we report such a case of a 65-year-old male who developed nonfibrotic HP and eosinophilic esophagitis after exposure to hair dye.
Abdulla et al. (Thu,) studied this question.