角かく質しつ

noun, noun which may take the genitive case particle 'no'

keratin; horny substance; corneum; cuticle; collagen

Refers to the tough protein material in skin, hair, nails, and horns. In cosmetic contexts, often relates to dead skin cells or calluses. The gloss 'collagen' is less common; primarily means keratin.

• 角かく質しつを柔やわらかくするクリームを使つかっています。

  I use a cream that softens keratin.

• かかとの角かく質しつが厚あつくなってきた。

  The callus on my heel has gotten thick.