Hydrocolloids comprise a combination of polymers, namely carboxymethylcellulose (CMC), held in suspension in water and may also contain polysaccharides, proteins and adhesives. Typically, they are used on minimally to moderately exuding superficial or partial thickness wounds to encourage autolysis and absorb excess fluid forming a gel at the wound surface. They may also be used prophylactically in the protection of new epithelial tissue or over bony prominences.