A hydrocolloid dressing is a wound dressing made of two layers. The inner layer is adhesive and contains gel-forming particles, such as carboxymethylcellulose, gelatin, or pectin. The outer layer is usually a polyurethane film or foam.

When the inner layer touches wound fluid (exudate), the particles absorb the fluid and swell into a soft gel. The gel often looks like a white or cloudy bubble under the dressing. This is normal and does not, by itself, mean the wound is infected.

Hydrocolloid dressings are commonly used on shallow wounds that produce light to moderate amounts of fluid. Examples include minor cuts, scrapes, blisters, superficial burns, skin-graft donor sites, pressure ulcers, venous leg ulcers, and small acne lesions. For diabetic foot ulcers, a healthcare professional should decide whether a hydrocolloid dressing is appropriate.

The outer layer protects the wound from the outside environment and is generally water-resistant. Depending on the product, the wound, and the manufacturer’s instructions, a dressing can stay in place for several days.

Hydrocolloid dressings are generally not suitable for wounds with heavy drainage, active bleeding, signs of infection, or exposed bone or tendon. They are also a poor fit for wounds that need frequent checking or drainage. The right dressing depends on the type, depth, and location of the wound and how much fluid it produces.

Disclaimer: This information is for general educational purposes only and does not replace professional medical advice, diagnosis, or treatment. Consult a qualified healthcare professional for advice about any health concern.