Baking soda can help reduce itching from bug bites, and the CDC lists it as a recommended home remedy for mosquito bites specifically. It works best as a simple paste applied directly to the bite, and while it won’t make a bite disappear, it can take the edge off that maddening itch while your body heals.
Why Baking Soda Helps With Itching
When a mosquito bites you, it injects saliva that triggers a localized immune response. Your body releases histamine, which causes the swelling, redness, and itch. Baking soda is alkaline (high pH), and when applied as a paste, it’s thought to help neutralize some of the irritating compounds at the bite site. The exact mechanism hasn’t been pinned down in clinical trials, but the practice has enough support that the CDC includes it in their guidance for managing mosquito bites at home.
For bee stings, the theory is more specific. Honey bee venom is acidic, so the alkaline baking soda paste may directly neutralize it, reducing both itching and swelling. This logic doesn’t extend to all stinging insects, though. Wasp venom is alkaline, so baking soda wouldn’t have the same neutralizing effect. If you’re not sure what stung you, baking soda is still unlikely to make things worse, but it may not provide as much relief depending on the insect.
How to Make and Apply the Paste
Mix one tablespoon of baking soda with just enough water to form a thick paste. Apply it directly to the bite and leave it on for about 10 to 15 minutes, then rinse it off with cool water. You can reapply a few times a day as needed. That’s it. Some people add a drop of white vinegar to the mix, but plain water works fine.
If you’re dealing with a lot of bites at once (after a camping trip or a run-in with a swarm), adding a few tablespoons of baking soda to a cool bath can provide more widespread relief. This is especially practical for kids who are covered in mosquito bites and won’t sit still for individual paste applications.
Which Bug Bites Respond Best
Baking soda is most commonly recommended for mosquito bites, where it can help calm the itch response. It also has a reasonable track record with bee stings, fire ant bites, and flea bites. For any bite where the primary complaint is surface-level itching and mild swelling, it’s a reasonable first option when you don’t have antihistamine cream on hand. St. Louis Children’s Hospital, for instance, recommends baking soda paste as a backup when hydrocortisone cream isn’t available.
It’s less useful for bites that cause deep tissue reactions, like certain spider bites, or for ticks, where the priority is proper removal rather than itch relief. And if a bite is producing significant swelling, spreading redness, or signs of an allergic reaction (difficulty breathing, hives spreading beyond the bite), baking soda isn’t the right tool. Those situations call for medical attention.
Safety and Skin Sensitivity
For most people, a diluted baking soda paste poses very little risk. Animal studies found no skin irritation when baking soda was applied under patches for 24 hours, and testing in over 100 humans with diluted baking soda solution showed no evidence of irritation either.
The problems documented in medical literature all involve excessive, prolonged use on damaged skin. In one case, heavy and repeated application of baking soda on an infant’s diaper rash (over broken skin) led to a chemical imbalance called metabolic alkalosis, which resolved once the baking soda was stopped. Similar issues occurred in adults who applied baking soda daily to large open wounds over extended periods. The common thread in these cases was application to broken or compromised skin, in large amounts, for days or weeks.
For a typical bug bite, brief application of a small amount of paste a few times a day carries minimal risk. A few practical precautions to keep in mind:
- Avoid broken skin. If you’ve scratched a bite open or it’s oozing, skip the baking soda. Applying it to raw, broken skin increases the chance of irritation and, in theory, absorption.
- Don’t leave it on for hours. Ten to fifteen minutes per application is plenty. There’s no benefit to caking it on and leaving it overnight.
- Watch for irritation. If the skin around the bite gets redder or more irritated after applying the paste, rinse it off and don’t reapply.
- Be cautious with infants. Babies have thinner, more permeable skin. A brief, light application is fine for older children, but for very young infants, check with your pediatrician first.
How It Compares to Other Remedies
Baking soda is a solid option when it’s what you have on hand, but it’s not necessarily the strongest choice. Over-the-counter hydrocortisone cream (1%) is generally more effective at reducing inflammation and itch because it directly suppresses the immune response at the bite site. Oral antihistamines work systemically and can help when you have multiple bites or when itching is keeping you up at night.
Cold compresses are another simple alternative. Applying a cold pack or ice wrapped in a cloth for 10 minutes constricts blood vessels and numbs the area, which can provide faster temporary relief than baking soda. Many people find that combining a cold compress with a baking soda paste gives the best results from home remedies alone.
Calamine lotion, colloidal oatmeal baths, and aloe vera gel are other common options that work through different mechanisms. None of these, including baking soda, will dramatically speed up how fast a bite heals. They’re all about managing symptoms while your immune system does its work, which typically takes three to seven days for a standard mosquito bite.