Spider Bites and Staph Infections: What You Need to Know

Staph infections after spider bites are uncommon. Spider bites inject venom; staph requires bacterial entry through broken skin.

However, scratching a spider bite can introduce skin flora (S. aureus) and cause secondary infection. Necrotic-appearing lesions are often misattributed to spiders but may be community-acquired MRSA.

If a bite wound develops increasing redness, warmth, pus, or fever, seek medical evaluation—regardless of initial cause. Treatment is the same: antibiotics ± drainage.