mudpack

/ˈmʌdˌpæk/
noun
  1. A cosmetic paste made of clay or mud, applied to the face or body to cleanse and improve the skin.
    • She applied a cooling mudpack to her face after a long day in the sun.
    • He tried a homemade mudpack using green clay and water.
    • The spa offers a mineral mudpack treatment that leaves skin feeling soft.