What to Do If You Get Pepper Spray on Your Skin

Getting pepper spray off your skin comes down to two things: physically removing the oily residue with soap and water as quickly as possible, and then waiting. Research consistently shows that time after exposure is the strongest predictor of pain relief, and no popular remedy, whether milk, baby shampoo, or antacid, has been shown to speed recovery beyond what plain water irrigation does. That does not mean you should stand around doing nothing, though. How you handle the first few minutes matters for how much chemical stays on your body and how long the burning lasts.

Why Pepper Spray Burns So Intensely

Pepper spray contains capsaicinoids, the same class of compounds that make chili peppers hot, but concentrated far beyond anything you would encounter in food. These capsaicinoids activate a specific receptor on sensory nerve endings in the skin called TRPV1, which is the body’s heat-and-pain sensor. When capsaicinoids bind to it, the receptor triggers a flood of signaling molecules that produce what researchers call cutaneous neurogenic inflammation: a rapid-onset burning pain, redness, and localized swelling.¹ The pain is real inflammation, not just a sensation. Your skin is reacting as if it has been exposed to a thermal burn, even though no actual heat damage has occurred.

The same TRPV1 receptors are also found in the cells of the skin’s outer layer, not just in nerve endings. That is part of why the redness and swelling can be so pronounced and why the affected area stays tender to the touch even after the initial sharp pain begins to fade. Understanding this helps explain why so many home remedies fail: the capsaicinoid molecules bind tightly to these receptors, and once that binding has happened, the inflammatory cascade is already underway. You can wash away the excess chemical sitting on the skin’s surface, but the molecules that have already docked onto your nerve endings have to run their course.

Immediate Steps After Exposure

The first priority is to stop the exposure from getting worse. If pepper spray has landed on your clothing, those clothes are now a reservoir of capsaicinoid oil that will keep transferring to your skin and can re-expose you every time you shift or brush against the fabric. Remove contaminated clothing as soon as you safely can, handling it by clean edges or corners to avoid spreading the residue to your hands. Bag the clothes separately; they will need to be laundered before you wear them again.

Move to fresh air if the spray was deployed in an enclosed or poorly ventilated space. Pepper spray is designed to affect eyes and airways as well as skin, and staying in a cloud of aerosolized capsaicinoids will compound your symptoms. Once you are in a cleaner environment, begin flushing the affected skin with large amounts of cool or lukewarm water. Avoid hot water. Heat opens pores and can intensify the burning sensation because TRPV1 receptors respond to both capsaicin and elevated temperature, so warm conditions make them fire more aggressively.

After rinsing, wash the area with a mild soap. A systematic review of skin decontamination studies found that water alone left significant amounts of certain contaminants on the skin, while soap and water consistently outperformed plain water for physical removal of oily substances.² Capsaicinoids are oil-based, so soap’s ability to emulsify and lift oils is exactly what you need here. Plain dishwashing liquid works; you do not need a specialty product. Lather, rinse, and repeat at least two or three times. Pat the skin dry rather than rubbing, which can push residual capsaicinoid into the skin or spread it to unaffected areas.

Why Milk, Baby Shampoo, and Antacids Do Not Work as Well as You Have Heard

If you have been pepper-sprayed, someone nearby will almost certainly suggest milk, a diluted antacid solution, or baby shampoo. These remedies are passed around with genuine conviction, and they sound plausible: milk contains casein, a protein that binds capsaicin in the mouth, and antacids soothe irritated tissue. The problem is that controlled studies have repeatedly failed to find a meaningful advantage for any of them over simple water irrigation when it comes to skin exposure.

A randomized controlled trial that tested five different treatment approaches after oleoresin capsaicin exposure, including various topical agents, found no significant difference in pain relief between any of the treatment groups. The only variable that reliably predicted decreasing pain was the amount of time that had passed since exposure.³ A separate trial specifically designed to test baby shampoo against other decontamination agents reached the same conclusion. The researchers noted that their findings were consistent with an earlier study that had tested Maalox, lidocaine gel, milk, and baby shampoo head-to-head with water irrigation, and that earlier study had likewise found no evidence of benefit for any of them.⁴

This does not mean you should skip decontamination. Washing with soap and water physically removes the capsaicinoid oil from the skin surface, which limits the total dose your body absorbs and may shorten the overall duration of symptoms. The research just says that once you have rinsed the residue off, no topical remedy speeds up the resolution of the pain that is already underway. The burning will peak and then gradually subside on its own, usually within 30 to 60 minutes for skin-only exposure, though some people report lingering sensitivity for several hours.

One Topical Approach That Showed Some Effect

While most remedies tested against capsaicin-induced skin pain have come up empty, one exception worth knowing about is topical aspirin. In a controlled experiment, applying a dissolved aspirin solution to capsaicin-exposed skin reduced pain intensity and decreased the size of the flare response, the spreading redness around the exposure site. It also shrank the area of skin that was hypersensitive to light touch and pinprick.⁵ The aspirin did not, however, reduce heat sensitivity, meaning the skin still felt extra-painful when exposed to warmth. This tracks with the fact that aspirin blocks part of the inflammatory signaling cascade but cannot undo the direct sensitization of the heat receptor.

In practical terms, creating a topical aspirin paste by crushing tablets and dissolving them in a small amount of water is something you could do after decontamination, though it is not a standard first-aid recommendation and the research was conducted in a controlled lab setting, not a field scenario. It is also not something most people will have readily available in the moment. For most situations, the takeaway is straightforward: wash thoroughly with soap and water, avoid touching your face, and let time do the rest.

How to Avoid Spreading It to Others

One of the most underappreciated dangers of capsaicinoid exposure is secondary contamination. The oily residue clings to skin, hair, and fabric, and it transfers easily by touch. A case report documented a three-year-old child who suffered severe pain and swelling of the lips and tongue after touching her mother’s arm, which had been treated with a high-concentration capsaicin patch three hours earlier. The child then touched her own mouth, transferring the residue. It took about two hours for the pain to fully subside after cleansing and cooling.⁶

If you have been sprayed, your hands are the main vector for spreading capsaicinoids to your eyes, mouth, and anyone you touch. Wash your hands first and most thoroughly, especially under the nails and around the cuticles where the oily residue hides. Until you are confident your hands are clean, do not touch your face, do not touch children or pets, and do not handle food. If someone is helping you decontaminate, they should wear gloves or at minimum wash their own hands immediately afterward. The capsaicinoid oil does not evaporate quickly; it can stay active on surfaces for hours.

Clothing that was contaminated should be washed separately from other laundry, ideally on a warm cycle with detergent. Some people find they need to wash the items twice. If you wore contact lenses during the exposure, discard them rather than trying to clean them, as capsaicinoid residue is nearly impossible to fully remove from soft lens material.

When to Go to the Emergency Room

For the vast majority of people, pepper spray exposure to the skin is intensely painful but self-limiting. The burning fades, the redness resolves, and there is no lasting damage. There are situations, however, where medical attention is appropriate:

• Blistering: If the skin develops blisters, especially large or fluid-filled ones, you may be dealing with a chemical burn that needs professional wound care.
• Persistent redness beyond 24 hours: Some degree of redness for the rest of the day is normal, but inflammation that worsens or fails to improve by the next day could indicate a more serious dermatitis or an allergic reaction.
• Eye involvement: Pepper spray to the eyes is a different category of exposure entirely. If the burning, blurred vision, or tearing has not improved substantially within 30 to 45 minutes of thorough irrigation, or if you experience ongoing vision changes, seek emergency care.
• Breathing difficulty: Inhaled capsaicinoids can cause bronchospasm, especially in people with asthma or other respiratory conditions. Wheezing, tightness in the chest, or difficulty catching your breath after exposure warrants immediate medical evaluation.
• Large body-surface exposure: If spray covered a substantial portion of your torso or limbs, the systemic inflammatory load is higher and professional monitoring is reasonable.

People with pre-existing skin conditions like eczema or psoriasis may experience a more severe reaction because their skin barrier is already compromised, allowing deeper penetration of capsaicinoids. If you fall into that category, a lower threshold for seeking care makes sense.

Occupational and Repeated Skin Exposure

Most advice about pepper spray assumes a one-time accidental or defensive exposure. But some people encounter capsaicinoids on their skin regularly: law enforcement officers who train with pepper spray, workers in hot pepper processing facilities, and people who use high-concentration capsaicin pain patches. Repeated or prolonged contact with capsaicinoids carries a different risk profile than a single acute exposure.

Case reports in dermatology literature have documented occupational allergic contact dermatitis caused by capsicum in people who handle peppers or capsaicin products routinely.⁷ Unlike the immediate irritant reaction that everyone gets from pepper spray, allergic contact dermatitis is an immune-mediated response that develops over time with repeated exposure. Once sensitized, even small amounts of capsaicinoid on the skin can trigger a delayed rash that looks different from the typical immediate burn: itchy, possibly vesicular, and slower to resolve. People who work with capsaicinoids regularly and notice that their skin reactions are getting worse over time rather than better should mention the occupational exposure to a dermatologist, because the management of allergic contact dermatitis is different from that of a one-time irritant exposure.

Common Mistakes That Make It Worse

A few errors come up repeatedly in first-aid scenarios and are worth calling out specifically. The first is rubbing. When your skin is on fire, the instinct is to scrub aggressively, but rubbing drives the oily capsaicinoid deeper into the skin and can spread it to adjacent areas. Blot, rinse, and lather gently. The second is using hot water. As noted earlier, heat amplifies the pain through the same receptor system that capsaicin activates. Cool to lukewarm water is the right call. Some people even find brief application of a cold compress soothing after decontamination, though ice directly on irritated skin brings its own risks.

The third common mistake is incomplete hand-washing before touching the face. People spray their arm or torso, wash the visibly affected area, and then rub their eyes ten minutes later with hands that still carry invisible residue. Capsaicinoid oil is colorless once it dries, so you cannot tell by looking whether your hands are clean. Wash them as if you are scrubbing for surgery: soap, warm water, under the nails, between the fingers, for a full 20 to 30 seconds, and repeat.

A fourth mistake is recontamination from clothing or gear. People strip off a contaminated shirt, wash their skin carefully, and then pull the same shirt back on because it is all they have. If you cannot change clothes, at least turn the garment inside out so the most contaminated surface faces away from your skin, and plan to launder it as soon as possible. Shoes and belts are also easy to overlook. Any leather or fabric surface that caught overspray can re-expose you hours later when you handle it.