How to Safely Apply DMSO to Your Skin

Applying DMSO (dimethyl sulfoxide) to your skin is straightforward, but the compound’s unusual ability to penetrate skin and carry other substances along with it means careless use can cause real problems. DMSO is a colorless liquid originally derived as a by-product of paper manufacturing, and it has been used in medicine and by self-experimenters for decades.¹ Getting it right means paying attention to concentration, skin cleanliness, what else is on or near your skin, and knowing what side effects to expect versus what should make you stop.

Why DMSO Demands Extra Care

DMSO is not like most things you put on your skin. It penetrates the outer layer rapidly and, at higher concentrations, actually reorganizes the lipid structure of the skin barrier. Molecular simulations show that DMSO molecules accumulate in the outermost skin layer and weaken the bonds holding its lipids together. Above a certain concentration threshold, those lipids shift from a tightly packed state to a looser, more fluid one, which dramatically increases how easily other substances can pass through.² This is why DMSO has been studied extensively as a drug delivery vehicle: it can pull medications deeper into tissue and even into the bloodstream through the skin alone.

That same permeability-boosting property is also the main safety concern. When DMSO is on your skin, it can carry along anything else sitting on the surface, including contaminants, dyes, fragrances, cleaning product residues, or other topical medications. Research has shown that drugs mixed with DMSO often become more potent because more of the active ingredient reaches the target tissue, meaning smaller doses produce bigger physiological effects.³ That sounds beneficial in a clinical setting, but outside one, it means you could accidentally drive a harmful substance into your body.

Preparing Your Skin Before Application

Because DMSO is so effective at ferrying other molecules through your skin barrier, the single most important safety step happens before you ever open the bottle. Wash the area you plan to treat with plain soap and water, then rinse thoroughly and let it dry completely. You want bare, clean skin with no residue from lotions, sunscreens, perfumes, insect repellent, cleaning sprays, or anything else. If you have been handling chemicals, solvents, or even strongly pigmented foods like turmeric, wash your hands with extra care.

The same logic applies to what you wear. Latex or nitrile gloves are commonly used when handling DMSO if you do not intend for it to contact your hands. If you do apply it with bare fingers, avoid touching other surfaces or substances until you have washed DMSO off your hands. Some users apply DMSO with a clean cotton pad or gauze instead, which sidesteps the hand-contamination issue entirely.

Avoid applying DMSO over broken skin, open wounds, or areas with active rashes or infections. The barrier is already compromised in those spots, and adding a penetration enhancer on top of damaged tissue invites irritation or deeper absorption of whatever is present on the skin surface.

Choosing the Right Concentration

DMSO is sold in concentrations ranging from around 40% to 99.9% (pharmaceutical-grade pure). For topical skin use, most people dilute it or buy pre-diluted solutions. In the United States, DMSO is FDA-approved only for the treatment of interstitial cystitis (a bladder condition, administered intravesically) and as a preservative for organ transplants.⁴ Its topical use for pain, inflammation, or other conditions is off-label, which means you are largely navigating concentration choices without official prescribing guidance.

A commonly used range for skin application is 50% to 70% DMSO, diluted with distilled water or aloe vera gel. Higher concentrations, above 70 to 80%, are more likely to cause skin irritation, redness, and a stronger burning sensation. Very high concentrations (above roughly 90%) can produce intense burning and should not be applied to large skin areas without medical supervision. The molecular dynamics research discussed earlier confirms that higher molar fractions of DMSO create a more dramatic shift in skin lipid permeability, so you get both more penetration and more irritation as you go up in concentration.²

If you are new to DMSO, starting at the lower end of the range and working upward over several applications is the sensible approach. Dilute with distilled water rather than tap water, since tap water may contain chlorine or other treatment chemicals you do not want pulled through your skin.

How to Actually Apply It

Once your skin is clean and dry and your DMSO is at the concentration you want, the application itself is simple. Pour or drip a small amount onto the target area and spread it in a thin, even layer using a clean cotton pad or your clean fingertips. You do not need to saturate the skin or rub aggressively. A thin coat is enough because DMSO absorbs quickly, often within minutes. Many users describe a slight warming or tingling sensation almost immediately.

Let the application area air-dry rather than covering it with a bandage or clothing right away. DMSO needs a few minutes to absorb, and trapping it against fabric can transfer it to the material (some synthetic fabrics may react or release dyes that DMSO could then carry into your skin). Once the treated area feels dry to the touch, usually within five to fifteen minutes, you can cover it with clean clothing.

For the same contamination reasons, avoid applying DMSO right before handling anything you would not want absorbed. Cooking, gardening, or handling household chemicals immediately after application to your hands is risky. A good rule of thumb is to treat DMSO-wet skin as a one-way door: whatever touches it can go through it.

What Side Effects to Expect

Some side effects are so common with topical DMSO that they are essentially guaranteed, while others are less frequent and signal that you should stop or adjust your approach.

The most predictable reaction is a garlic-like or oyster-like taste and odor. DMSO is metabolized in the body to dimethyl sulfide, a sulfur compound that is exhaled through the lungs and excreted through the skin. You may notice the taste within minutes of applying DMSO anywhere on your body, even on your ankle. The smell can persist for a day or two and is noticeable to people around you. There is no practical way to prevent it. It fades on its own once you stop applying DMSO, but it is the single most common reason people abandon topical DMSO use.

On the skin itself, the most frequently reported reaction is a local burning sensation. A systematic review of adverse reactions across dozens of studies found that burning was the most common dermatological side effect, reported in at least 13 separate studies. In one study, every participant experienced it. Some people also develop transient swelling, itching, and redness at the application site.⁵ Most of these skin reactions are short-lived, resolving within minutes. Two studies in that same review found that skin reactions actually disappeared after several days of continuous treatment, suggesting the skin can adapt to repeated exposure.

More serious reactions, including blistering, persistent redness, or widespread itching, have been reported in some cases and led to discontinuation of DMSO treatment.⁵ If your skin reaction is more than a mild, passing sting, lower the concentration or stop use entirely. A patch test on a small area of your inner forearm before applying DMSO to a larger region is a reasonable precaution.

The Drug Interaction Problem

This is the risk that most casual users underestimate. Because DMSO enhances skin permeability so effectively, applying it on top of or alongside other topical products can dramatically change how much of those products enters your body. Research on the anti-inflammatory drug celecoxib found that combining it with DMSO produced such high skin permeation that it raised concerns about unintended systemic effects, meaning the drug was no longer just acting locally but was entering the bloodstream at meaningful levels.⁶

The practical takeaway is this: do not layer DMSO with other topical medications, creams, or products unless specifically instructed to do so by a healthcare provider. If you use a prescription topical (a steroid cream, a retinoid, an antifungal), apply it at a different time of day or on a different area of skin. The same goes for over-the-counter pain creams, muscle rubs, or numbing sprays. DMSO does not distinguish between substances you want it to carry and substances you do not.

This also means you should be cautious about the purity of the DMSO you buy. Pharmaceutical-grade or at minimum reagent-grade DMSO (99.9% purity before you dilute it) is the standard recommendation for topical use. Industrial-grade DMSO, which is cheaper and widely available, may contain impurities that DMSO could pull straight into your tissue. If the label does not specify purity or grade, treat it as industrial and avoid skin contact.

Long-Term Safety and What the Research Shows

Concerns about DMSO damaging the eyes (specifically causing changes to the lens) have circulated since early animal studies in the 1960s. These findings were largely responsible for the FDA pulling back on DMSO clinical trials for a period. Modern data in humans is more reassuring. A long-term open-label study followed nearly 800 people who applied a topical diclofenac-DMSO solution to their knees for osteoarthritis. Participants applied the product daily for an average of 204 days, with some continuing for a full year. Ocular examinations and routine lab work were included in the safety monitoring, and the study found no increased risk of cataract events or cardiovascular problems.⁷

That study used a commercially formulated product with controlled DMSO concentration, so its results do not automatically transfer to someone applying undiluted DMSO from a bottle purchased online. But it does suggest that moderate-concentration topical DMSO used over months is not obviously harmful to the eyes or major organs in most people. If you plan to use DMSO regularly, having a baseline eye exam and periodic follow-ups is a reasonable precaution, particularly if you are using higher concentrations than those in commercial preparations.

Where on the Body You Can and Cannot Apply It

DMSO is most commonly applied to joints, muscles, and areas where pain or inflammation is the target, such as the knee, shoulder, elbow, or lower back. The skin in these areas is relatively thick compared to more sensitive regions, which provides a modest buffer against irritation.

Areas to avoid:

Face: The skin is thinner and more sensitive, and proximity to the eyes increases risk. DMSO fumes can cause eye irritation even when applied nearby.
Groin and genitals: Extremely thin, highly vascular skin makes irritation and systemic absorption more likely.
Open wounds or surgical sites: As mentioned earlier, breached skin plus a penetration enhancer is a recipe for complications.
Near mucous membranes: The mouth, nose, and eyes are already highly permeable and do not need DMSO’s assistance in absorbing chemicals.

If you must apply DMSO to a sensitive area, use a lower concentration and a very thin layer, and watch closely for excessive burning or redness.

What to Do if You Have a Bad Reaction

The most common adverse skin reactions, burning, redness, and mild itching, typically resolve within minutes of application and do not require intervention beyond waiting it out.⁵ If the burning is intense or the area begins to swell noticeably, wash the treated area with soap and water immediately. Since DMSO absorbs quickly, this may not remove all of it, but it limits further exposure. Do not apply additional products to “soothe” the irritated area right away because DMSO lingering in the skin could carry those products in as well. Wait until the irritation fully resolves before putting anything else on the skin.

For systemic symptoms, such as a severe headache, nausea, dizziness, or difficulty breathing after application, remove any remaining DMSO from the skin, move to fresh air (since DMSO has a mild vapor), and seek medical attention. These reactions are rare with topical application at moderate concentrations, but they warrant caution, especially in people who have never used DMSO before.

Storing and Handling DMSO at Home

DMSO is hygroscopic, meaning it readily absorbs water from the air. An opened bottle will gradually dilute itself if left unsealed. Store it in a tightly closed glass container, as DMSO can dissolve or leach compounds from certain plastics. Amber or opaque glass is ideal, kept at room temperature and away from direct sunlight. Most pharmaceutical-grade DMSO has a long shelf life when stored properly, but once you dilute it with water, the mixture can support microbial growth over time. Prepare diluted batches in small quantities and use them within a few weeks, or keep them refrigerated.

DMSO has a relatively high freezing point for a liquid, around 18°C (about 65°F). If your room is cool, you may notice it becoming viscous or even solidifying. This is normal and does not indicate degradation. Let it warm to room temperature and it will return to its liquid state.

Using DMSO with Herbal or Alternative Preparations

A significant number of people who seek out DMSO are interested in combining it with herbal extracts, essential oils, or other alternative remedies in order to drive those compounds deeper into the tissue. This is where the safety picture gets murkier. The enhanced permeation that DMSO provides does not discriminate: it can increase absorption of beneficial compounds and toxic ones equally. Many essential oils contain compounds that are irritating or harmful at high tissue concentrations, and DMSO can push those concentrations well beyond what you would get from applying the oil alone.

If you choose to combine DMSO with another topical substance, use the lowest effective concentration of both, test on a very small patch of skin first, and wait at least 24 hours before applying to a larger area. Be especially cautious with any substance you have not previously used on your skin, since DMSO can amplify allergic or irritant reactions that might otherwise stay minor.

Commercially available DMSO products formulated for topical use sometimes include aloe vera or other carriers that have a track record of skin safety. These are generally a more predictable starting point than mixing your own blends at home, where precise concentrations are harder to control and contamination risks are higher.

1
PubMed Central. Dimethyl sulfoxide: history, chemistry, and clinical utility in dermatology
2
PubMed Central. The permeability enhancing mechanism of DMSO in ceramide bilayers simulated by molecular dynamics
3
PubMed. Pharmacologic and biochemical considerations of dimethyl sulfoxide
4
PubMed. Dimethyl sulfoxide (DMSO): a solvent that may solve selected cutaneous clinical challenges
5
PubMed Central. Adverse reactions of dimethyl sulfoxide in humans: a systematic review
6
PubMed. In Vitro and In Vivo Evaluation of DMSO and Azone as Penetration Enhancers for Cutaneous Application of Celecoxib
7
American Journal of Therapeutics. A Long-Term, Open-Label Study to Confirm the Safety of Topical Diclofenac Solution Containing Dimethyl Sulfoxide in the Treatment of the Osteoarthritic Knee