Why can't hydrocolloid dressings be used on infected wounds?

Hydrocolloid dressings have become increasingly common in recent years, readily available in pharmacies and online. Many people stock up on a few at home, applying them to any wound. However, there is one important exception to remember: wounds showing obvious signs of infection are precisely where hydrocolloid dressings should not be used.

Why should infected wounds be covered up?

Hydrocolloids have a semi-sealed design, creating a warm, moist, and largely airtight microenvironment at the wound site after application. For clean, healing wounds, this environment is a breeding ground—cells migrate quickly and growth factors are well preserved. However, from another perspective, it is also a breeding ground for bacteria.

Once a wound becomes infected, the enclosed environment allows bacteria to multiply faster. Exudate and pus are trapped under the dressing, invisible from the outside and unable to escape from the inside, allowing the infection to deepen silently without your awareness. In addition, hydrocolloid dressings are usually changed only every 3-5 days, which is too long an observation interval for an infected wound.

How can I tell if a wound is infected?

No need to memorize complicated indicators, just focus on four signals:

First, the redness and swelling are expanding, with the redness extending one or two centimeters beyond the wound edge and continuing to spread outwards; second, the pain is worsening, or a throbbing pain is appearing; third, the exudate is changing color—becoming cloudy, yellowish-green, or suddenly increasing in amount; fourth, there is an unusual odor. If this is accompanied by systemic reactions such as fever and fatigue, don't hesitate, this is not a problem that can be solved by applying any dressing.

If two or more of the four symptoms are present, it can generally be treated as an infection. First, clean and disinfect the wound, and seek medical attention if necessary, rather than simply covering it with a dressing yourself.

What should be used during the infection period?

The key to managing infection during the infection period can be summarized in three words: clearing, draining, and controlling. This means cleaning the infection site, allowing pus to drain, and using antibacterial measures when necessary. Products with antibacterial components, such as silver ion dressings, or dressings that need to be changed daily or every other day for easy observation, are more suitable than hydrocolloid dressings. For deep infections or persistent fever, systemic antibiotics must be used; dressings cannot replace medication.

When will hydrocolloids be introduced? 

Its true value is realized only after the infection is under control. When the redness subsides, the exudate clears, and bright red granulation tissue grows in the wound, a stable, moist environment is exactly what healing needs. Many wounds are not "useless" because hydrocolloids are "used at the wrong time"—using them during the infection phase exacerbates the problem, while being reluctant to use them during the recovery phase results in losses on both ends.

Just remember the order in reverse: control the infection first, then heal the wound.

What kind of wounds are you keeping the hydrocolloids you have at home for?

It can be kept on hand, but only in the right places: abrasions, the recovery period of superficial burns, clean incisions after minor surgery, first and second degree pressure sores, and wounds after blisters have burst—these are its main applications for wounds with little exudate and no signs of infection. Its advantages are indeed obvious: it is waterproof, so you don't need to wrap it up when showering; it is convenient, so you don't need to change it every day; and it is relatively gentle to remove, unlike ordinary adhesive tape which can easily tear the skin.

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Editor: kiki Jia