Most spider bites heal on their own within one to three weeks with basic home care: cleaning the wound, applying ice, and keeping the area elevated. The vast majority of spiders you’ll encounter aren’t dangerous, and their bites cause temporary pain, redness, and swelling similar to a wasp sting. What matters most is proper first aid in the first few hours, consistent wound care over the following days, and knowing the warning signs that something more serious is happening.
First Aid in the First Hour
Start by washing the bite with mild soap and water. This simple step removes bacteria from the skin surface and lowers your risk of infection. Pat the area dry and apply antibiotic ointment, repeating the ointment three times a day for the first several days.
Next, apply a cool compress for 15 minutes each hour. A clean cloth dampened with cold water or wrapped around ice works well. This slows swelling and dulls pain more effectively than leaving the bite alone. Keep this 15-minutes-on, 45-minutes-off cycle going for the first few hours, especially if swelling is noticeable. If the bite is on your hand, arm, foot, or leg, elevate that limb above heart level whenever you’re sitting or lying down. Elevation reduces fluid buildup at the bite site and helps the swelling go down faster.
Managing Pain and Itching
Over-the-counter pain relievers like ibuprofen or acetaminophen handle most spider bite pain. Ibuprofen also reduces inflammation, which makes it a good first choice if you don’t have a reason to avoid it.
Itching often kicks in as the bite starts healing. An oral antihistamine like diphenhydramine (Benadryl) or cetirizine (Zyrtec) can take the edge off. Diphenhydramine causes drowsiness, so cetirizine is the better daytime option. Resist scratching the bite, since broken skin invites bacteria and slows healing.
What a Normal Bite Looks Like as It Heals
A typical non-venomous spider bite leaves small puncture marks surrounded by a red, swollen bump. It looks a lot like a bee sting. Over the first 24 to 48 hours, the redness and swelling peak, then gradually fade. Most people notice significant improvement within a week, and the bite clears completely in two to three weeks. A small, flat mark on the skin may linger slightly longer.
Don’t be alarmed if the bite itches more on days two through four. That’s your immune system doing its job, breaking down the small amount of venom and repairing tissue. As long as the redness isn’t expanding and there’s no increasing warmth or pus, you’re on track.
Brown Recluse Bites: A Different Timeline
Brown recluse bites follow a more complicated path. Within 24 hours, a small blister often forms surrounded by redness. Over the next three to five days, the venom can cause the tissue around the bite to break down, creating an open ulcer. The venom’s destructive activity is temperature-dependent, which is why cool compresses are especially important for suspected brown recluse bites. Keep applying cold packs for the first 72 hours to slow the spread of tissue damage.
By seven to 14 days, a severe bite may develop into a wound that takes months to fully close. The majority of brown recluse bites, however, heal within three weeks. A thick, dark scab forms over the wound as new skin grows underneath. During this period, the bite needs daily monitoring and proper wound care: keep it clean, loosely bandaged, and elevated. Avoid popping blisters or picking at scabs, as both increase infection risk and delay healing.
If you suspect a brown recluse bite, seek medical attention. Bring the spider if you can. Doctors will monitor the wound daily until it stabilizes, and in severe cases may need to remove dead tissue to help healthy skin regenerate.
Black Widow Bites: Systemic Symptoms
Black widow bites cause a different kind of problem. The bite itself may look minor, but the venom affects your nervous system rather than your skin. Expect intense muscle pain and cramping, often in the abdomen, back, or chest, within one to three hours. Some people also experience nausea, sweating, and elevated blood pressure.
Home care alone isn’t sufficient for black widow bites. In the emergency room, treatment focuses on controlling muscle pain and spasms. An antivenom exists and is typically recommended for children under 12, adults over 60, and anyone with severe symptoms. For healthy adults between 16 and 60, doctors may manage symptoms with muscle relaxants and pain medication instead. Warm baths can also provide significant relief from the muscle cramping.
Signs the Bite Is Getting Infected
Secondary bacterial infection is the most common complication of any spider bite. Watch for these warning signs in the days following a bite:
- Expanding redness that spreads beyond the original bite area, especially if it forms streaks moving away from the wound
- Increasing warmth around the bite when you touch it
- Pus or cloudy drainage from the puncture site
- Worsening pain after the first 48 hours instead of improvement
- Fever or chills developing days after the initial bite
These are signs of cellulitis, a skin infection that needs antibiotics. Left untreated, cellulitis can spread rapidly and become serious. If you notice any combination of these symptoms, get medical attention the same day.
It Might Not Be a Spider Bite
Here’s something worth knowing: many skin infections are misidentified as spider bites. MRSA, a type of antibiotic-resistant staph infection, frequently looks like a spider bite in its early stages. Johns Hopkins Medicine specifically notes that a MRSA infection can mimic a spider bite. The key difference is that most people never actually see the spider. If you woke up with a red, swollen bump but didn’t witness a spider biting you, a bacterial infection is a real possibility, and the treatment is completely different. A doctor can swab or culture the wound to tell the difference.
Tetanus and Spider Bites
Spider bites are considered puncture wounds, which means your tetanus vaccination status matters. If you’ve completed your primary tetanus vaccine series and received a booster within the last five years, you’re covered regardless of wound type. If your last tetanus shot was more than five years ago and the bite looks dirty or severe, CDC guidelines recommend a booster. If you can’t remember when your last tetanus shot was, or you never completed the full series, get vaccinated.
Speeding Up Recovery Day by Day
For the first three days, your priorities are cold compresses, elevation, antibiotic ointment, and keeping the wound clean. Change bandages at least once daily. After 72 hours, if the bite is improving, you can scale back the cold compresses and focus on keeping the area clean and protected from friction or re-injury.
During the second week, the bite should be noticeably smaller and less tender. New pink skin forming around the edges is a good sign. Continue applying antibiotic ointment if the skin is still broken. Avoid sun exposure on a healing bite, as new skin is more vulnerable to UV damage and can develop permanent discoloration.
By week three, most bites are fully healed or reduced to a faint mark. If a bite is still open, actively draining, or not shrinking after two weeks, something else may be going on, whether that’s a venomous bite you didn’t recognize, a secondary infection, or a condition that was never a spider bite in the first place.