hyperkeratosis
thickening of the stratum corneum (the outermost layer of the epidermis), often associated with the presence of an abnormal quantity of keratin
en-US/ˌhaɪpɚˌkɛɹəˈtoʊsɪs/
thickening of the stratum corneum (the outermost layer of the epidermis), often associated with the presence of an abnormal quantity of keratin