A cold cloth or ice pack is the best first step for any bug bite, followed by an over-the-counter hydrocortisone cream or calamine lotion to control itching and swelling. Most bites respond well to these simple treatments within a few days, but the right approach depends on how your body reacts and what bit you.
Why Bug Bites Itch in the First Place
When a mosquito or other biting insect pierces your skin, it injects saliva containing proteins your immune system recognizes as foreign. Your body responds by releasing histamine, which triggers the familiar itch, redness, and swelling. Histamine binds to receptors on nerve endings in your skin, creating that almost irresistible urge to scratch. Some people’s immune systems overreact to these saliva proteins, producing larger welts and more intense itching than others experience from the same type of bite.
Start With a Cold Compress
Before reaching for any cream or lotion, wash the bite with soap and water to remove any remaining saliva or debris. Then apply a cloth dampened with cold water or wrapped around ice. Keep it on the bite for 10 to 20 minutes. Cold narrows blood vessels in the area, which reduces both swelling and pain. This simple step is often enough for mild bites that aren’t particularly itchy.
Best Over-the-Counter Topicals
For bites that keep itching after a cold compress, hydrocortisone cream is the go-to option. It’s a mild anti-inflammatory you can apply two or three times per day directly to the bite. The 1% concentration sold without a prescription works well for most insect bites and is safe for both adults and children.
Calamine lotion is another solid choice, especially if the bite is oozing or weepy. Its active ingredients, calamine and zinc oxide, work as skin protectants that dry out the area while providing a cooling sensation. Calamine is particularly useful when you have multiple bites spread across a larger area, since you can dab it on liberally without worrying about overusing a steroid cream.
A simple baking soda paste also provides temporary relief. Mix one tablespoon of baking soda with just enough water to form a thick paste, spread it over the bite, wait 10 minutes, then wash it off. It won’t last as long as hydrocortisone, but it’s a helpful option when you don’t have anything else on hand.
When to Add an Oral Antihistamine
If a bite swells significantly or the itching is intense enough to keep you up at night, an oral antihistamine can help from the inside out. Non-drowsy options like cetirizine (Zyrtec) or loratadine (Claritin) work well and won’t make you sleepy during the day. These block the histamine your body is releasing in response to the bite, reducing both the itch and the swelling more effectively than a topical cream alone. You can use an oral antihistamine alongside a topical treatment for stronger reactions.
What Not to Put on a Bite
Scratching is the single worst thing you can do. Breaking the skin opens the door for bacteria, particularly staph and strep, which can cause impetigo. This secondary infection starts as red, pimple-like sores that fill with pus, break open, and form a thick, honey-colored crust. Keeping your nails short and applying anti-itch treatments early helps you resist the urge.
For tick bites specifically, skip folk remedies like nail polish, rubbing alcohol applied to the tick, or a hot match tip. These don’t work and can cause the tick to release more saliva into the wound. Instead, remove the tick with fine-tipped tweezers by grasping it as close to your skin as possible and pulling upward with steady pressure. After removal, clean the area with soap and water, rubbing alcohol, or hand sanitizer.
Telling a Normal Reaction From an Infection
It’s common to confuse a large allergic reaction with an infection, but the two feel quite different. A big allergic reaction features a visible puncture mark at the center, significant redness and firmness around it, and prominent itching. An actual skin infection like cellulitis causes warmth, pain, and tenderness rather than itch. If your bite is itchy but not tender to the touch, infection is unlikely. If the area becomes increasingly painful, feels hot, or you develop a fever days after the bite, that pattern points toward bacterial infection and needs medical attention.
Preventing Bites in the First Place
DEET remains the most effective and well-studied insect repellent. Concentrations between 20% and 50% provide several hours of protection against mosquitoes and ticks, and going above 50% doesn’t meaningfully extend that duration. Picaridin is a good alternative, though concentrations below 20% may need more frequent reapplication. Oil of lemon eucalyptus (listed as PMD on labels) performs comparably to DEET in both effectiveness and duration.
Clothing matters too. Light-colored long sleeves, pants, and hats reduce exposed skin. You can treat clothing with permethrin, a synthetic insecticide that repels mosquitoes, ticks, and flies, but don’t apply permethrin directly to your skin. For sleeping outdoors or in areas with heavy mosquito activity, permethrin-treated bed nets are highly effective.