Aluminum acetate is a chemical compound used as a topical astringent to dry out weepy, irritated skin. You’ll most commonly encounter it sold as Domeboro powder packets or referred to as Burow’s solution, and it’s available over the counter for treating conditions like contact dermatitis, eczema flare-ups, athlete’s foot, and swimmer’s ear. The FDA classifies it as an OTC skin protectant, and the standard consumer product dissolves into a solution containing 0.13 to 0.5 percent aluminum acetate.
How It Works on Skin
Aluminum acetate is an astringent, which means it tightens and dries tissue. At the molecular level, aluminum has strong protein-precipitating properties. It changes the structure of proteins in skin cells so they lose the ability to swell and hold water, effectively drawing moisture out. This is why it’s particularly useful for skin problems that involve oozing, blistering, or waterlogged tissue. It also has mild antiseptic properties.
This drying action makes it the opposite of a moisturizer. It’s not meant for dry, flaky skin. Its strength is calming inflamed skin that’s producing too much fluid, like a blistering rash from poison ivy or a patch of eczema that won’t stop weeping.
Common Uses
Dermatologists rely on aluminum acetate soaks for a range of inflammatory skin conditions, especially those involving vesiculation (small blisters) or maceration (skin softened and broken down by moisture). The most common uses include:
- Contact dermatitis and poison ivy: Soaks help dry out blisters and reduce the oozing that makes these rashes so uncomfortable.
- Eczema flare-ups: Particularly exudative eczema where the skin is actively weeping fluid.
- Pompholyx: A type of eczema that causes small, intensely itchy blisters on the hands and feet.
- Athlete’s foot: Especially cases where the skin between the toes is waterlogged and peeling.
- Insect bites and minor skin irritation: The astringent action helps calm itching and reduce swelling.
Use for Swimmer’s Ear
Beyond skin conditions, aluminum acetate plays a role in treating otitis externa, commonly known as swimmer’s ear. A 5 percent aluminum acetate solution (stronger than the skin-protectant version) can be applied to the ear canal to help reduce inflammation and create an environment less hospitable to bacteria. When the ear canal is significantly swollen, a small wick may be placed inside the canal and moistened with the solution to help it reach deeper tissue. An acetic acid and aluminum acetate combination is sometimes used as ear drops, typically 4 to 6 drops every 2 to 3 hours for superficial infections of the outer ear canal.
How to Prepare and Use a Soak
Aluminum acetate is most commonly sold as a powder that you mix with water at home. The product labeled Domeboro, for instance, contains aluminum sulfate and calcium acetate, which react when dissolved to form aluminum acetate in solution. To prepare it, dissolve 1 to 3 packets in a pint (16 ounces) of cool or warm water and stir until fully dissolved. Don’t strain or filter the solution.
For a soak, submerge the affected area for 15 to 30 minutes, up to three times a day. For areas you can’t easily submerge, soak a clean, soft cloth in the solution and apply it loosely as a compress for the same 15 to 30 minutes. Discard the solution after each use and prepare a fresh batch next time.
One important detail: don’t cover a compress or wet dressing with plastic wrap or anything that blocks evaporation. The whole point is to let moisture escape from the skin. For some conditions, soaking too long can actually overdry the area, so stick to the recommended time frame.
Aluminum Acetate vs. Aluminum Chloride
These two aluminum-based compounds serve different purposes in dermatology. Aluminum acetate is an astringent for weepy, inflamed skin. Aluminum chloride, by contrast, is primarily used as an antiperspirant to control excessive sweating (hyperhidrosis). Both are trivalent aluminum salts, but they behave differently on the skin. Aluminum chloride is more likely to cause burning, stinging, and local irritation, while aluminum acetate is generally gentler and designed to soothe rather than block sweat glands.
Side Effects and Limitations
Aluminum acetate is well tolerated by most people when used as directed. The most notable risk is overdrying the skin if soaks are too long or too frequent. Because the compound is specifically designed to pull moisture from tissue, using it on skin that isn’t actively oozing can leave the area dry, tight, and cracked.
Topical aluminum products in the concentrations found in OTC formulations show negligible absorption through the skin, so systemic effects are not a practical concern. If your skin becomes more irritated after using the solution, or if you notice no improvement after several days, the underlying condition likely needs a different approach.