For treating unsightly blemishes like pimples or rejuvenating your skin's glow, you use a facial mask. The mask should be applied all over the face or just certain areas, left on for sometime and then washed off. Similarly one can use a mask for treating the hair. A hair mask is a thick mixture of various ingredients, that can be applied to the hair surface and/or the scalp. This restorative product can have multiple benefits and effects on hair, like giving it a glow or shine, making it soft or reducing dandruff and other hair infection problems.