Crushed cucumber and milk, oats and honey with yogurt, as well as honey with lemon and olive oil all make wonderful packs for your face, neck and shoulders. The lactic acid in milk, along with the enzymes in yogurt serve, to mildly exfoliate the skin (which helps to get rid of top layer skin to expose the glowing skin underneath).
Parabens -- These can cause rashes and irritations in the skin and more serious problems after prolonged use.