A hydrocolloid is one of the types of dressing a clinician may choose. As with every dressing type, talk with your provider about which one to use.
Hydrocolloids are made of cross-linked, water-attracting materials containing cellulose, gelatin, or pectin. They come as sheets, paste or powder.
How they behave: at first they keep water out, but they slowly absorb water, letting more through and forming a gel. Hydrocolloids also lower wound pH, which slows the growth of bacteria. They can be placed across joints or used to fill wound cavities.
The drawback is short and worth knowing: you can’t see the wound through one. The dressing covers the wound rather than showing it.
Hydrocolloids are used for pressure wounds and wounds with minimal to moderate drainage, with changes every two to four days. They are not for necrotic (dead tissue) or infected wounds.
That is the reason this page can’t tell you whether a hydrocolloid suits your wound. Whether a wound is infected, or contains dead tissue, is a judgment made by examining it — not something to assess from a description.
On timing, how often a dressing is changed depends on the type of wound and the type of dressing. A schedule you have been given was set for your wound and comes before any general figure.