Spider Bite

Symptoms

DEFINITION

• Bite from a spider

Symptoms

• Bite symptoms include redness, pain, swelling
• Helpful if spider seen on the skin or in close proximity to the child

Types of Spider Bites

Black Widow Spider Bite

• A shiny, jet-black spider with long legs (total size 1 inch).
• A red (or orange) hourglass-shaped marking on its under-side.
• Causes immediate local mild pain, swelling and occasionally 2 fang marks.
• Severe muscle cramps (especially abdominal wall cramps) are present by 1 to 6 hours, and last 24 to 48 hours.
• Rarely causes death (EXCEPTION: bitten by several spiders or small child is bitten)
• Note: Many are dry bites because the fangs are small.
• The brown widow spider is related to the black widow and is found in southern US.
• Brown widow spider bites are treated the same as a black widow bite. 

Brown Recluse Spider Bite

• A brown spider with long legs (total size 1/2 inch).
• A dark violin shaped marking on top of its head
• Causes local pain and delayed blister formation in 4 to 8 hours
• The center becomes bluish and depressed (crater-like) over 2 to 3 days
• Skin damage may require skin grafting in 10% of cases.
• Systemic symptoms such as fever, vomiting, muscle pain can occur (but no life-threatening symptoms).
• Since brown recluse spiders are hard to identify, bring the spider along in a jar.

Non-dangerous Spider Bites

• More than 50 spiders in the U.S. have venom and can cause local, nonserious reactions.
• The bites are painful and mildly swollen for 1 or 2 days (much like a bee sting).
• Many single, unexplained, tender bites that occur during the night are due to spiders.

See More Appropriate Topic (instead of this one) If

• Boil suspected (i.e., painful red lump and NO spider bite), see RASH - LOCALIZED
• Not a spider bite, see INSECT BITES.

First Aid Advice for Black Widow Spider Bites: Apply an ice cube or ice pack to the bite for 20 minutes to reduce the spread of the venom (no tourniquet).

First Aid Advice for Shock: Lie down with the feet elevated.

Should I Call?

WHEN TO CALL YOUR DOCTOR

Care at Home

HOME CARE ADVICE FOR NON-DANGEROUS SPIDER BITES

1. Cleansing: Wash the bite thoroughly with soap and water.
2. Meat Tenderizer: Rub the bite area with a cotton ball soaked in a meat tenderizer solution for 20 minutes (EXCEPTION: avoid if near the eye). Do this once. If not available, apply an ice cube in a wet washcloth for 20 minutes.
3. Pain Medicine: Give acetaminophen (e.g., Tylenol) or ibuprofen as needed for pain.
4. Expected Course: Some swelling and pain for 1 to 2 days. It shouldn't be any worse than a bee sting.
5. Call Your Doctor If:
   • Severe bite pain persists over 2 hours after pain medicine
   • Abdominal pains or muscle spasms occur
   • Local pain lasts over 2 days (48 hours)
   • Bite begins to look infected
   • Your child becomes worse

And remember, contact your doctor if your child develops any of the "Call Your Doctor" symptoms.

Photo Example

Source: CDC PHIL

From the CDC's Public Health Image Library (http://phil.cdc.gov), ID#5449, in the public domain.

Source: CDC PHIL

From the CDC's Public Health Image Library (http://phil.cdc.gov), ID#1125, in the public domain.