Lipoid proteinosis (LP) is a rare autosomal recessive inherited genodermatosis in which amorphous hyaline material accumulation is seen in the skin, oral mucosa, eyelid, larynx, mucous membranes, and viscera. [1][2][3] LP is generally slow progressing, benign, and manifests itself with hoarseness and skin lesions in the first two years of life. 4 Three hundred fifty cases have been reported in the literature so far. [5][6][7][8] LP disease is more common in the southeast Anatolia region due to consanguineous marriages in this region of our country. 8 LP develops as a result of decreased expression in the extracellular matrix protein 1(ECM1) gene. [9][10][11] The ECM1 protein binds to the matrix metalloproteinase-9 (MMP9) enzyme, which plays an essential role in immune cell function. 12 Mutations in the ECM1 gene prevent this protein from adequately interacting with MMP9 and, thus, contribute to the pathological changes that develop in LP. 13 Oxidative stress plays a role in LP's pathogenesis. 13 Also, oxidative stress plays a role in the etiopathogenesis of hearing loss. [14][15][16] In this study, we aimed to investigate the effects of hyaline accumulation on cochlear function and hearing in LP patients who did not