The Complete Guide to Spider Bites

True bites are often solitary — one or two lesions — sometimes with localized pain more than itch. Visible fang marks are uncommon; redness and swelling vary by species and individual reaction.

Many clinicians label unexplained lesions 'spider bite' without confirmation. Photos and context help.

Black widow bites may cause muscle cramping, pain radiating from the site, and systemic symptoms — seek urgent care if suspected.

Brown recluse bites are over-diagnosed geographically; necrotic wounds have many non-spider causes. Geographic range matters — see our brown recluse blog for range reality.

Common house spiders rarely cause significant envenomation.

Mosquito bites itch more uniformly and appear after outdoor exposure. MRSA or other infections cause worsening pain, pus, and fever — not responsive to antihistamines alone.

Clean the site, cool compress, elevate if swollen. OTC pain relievers if needed. Antihistamines help if itch dominates.

Photograph daily if the wound evolves — clinicians use serial images.

Severe pain, muscle spasms, spreading ulceration, fever, or red streaks need prompt evaluation.

Any systemic allergic symptoms require emergency care.

Shake out gloves, boots, and stored clothing. Reduce clutter in garages and basements. Use gloves moving firewood.

Location pages index spider bites on hand, arm, leg, and other areas when local context matters.