Spider Bites and Insect Stings

General Treatment

For general spider bites with no systemic reaction, treatment should include cleaning the wound with soap and water, applying cold compresses, and using oral antihistamines for pain and itching; antibiotics are not necessary unless there is evidence of secondary infection, as recommended by the American Academy of Allergy, Asthma, and Immunology 1
Oral analgesics may be considered for pain management, and a short course of oral corticosteroids may be beneficial for severe swelling, although definitive proof of efficacy is lacking 1
The American Heart Association recommends removing rings and other constricting objects from the affected extremity to minimize venom spread, and rest and immobilize the bitten extremity 2
Wound care may include cleaning and dressing the wound, and ensuring tetanus immunization is current, as recommended by 3, 4

Fire ant stings typically cause a sterile pseudopustule within 24 hours, and the vesicle should be left intact and kept clean to prevent secondary infection 1

Patients who have had large local reactions to insect stings may be at up to 10% risk of eventually having a systemic reaction to subsequent stings 1
Activate emergency services for severe symptoms, such as difficulty breathing, signs of shock, or severe pain, as recommended by the American Heart Association 2
Avoid inappropriate treatments, including suction, tourniquets (except temporarily for severe bleeding), electric shock, and direct pressure immobilization bandages, as advised by the American Heart Association 2, 5, 6 and the Critical Care society 7

Secure airway if altered consciousness (GCS <8) to prevent respiratory complications, and maintain normoventilation to prevent hypoxemia, as advised by the Critical Care society 7
Apply local compression to limit life-threatening bleeding, and consider tourniquet application as a temporary measure for extremity bites with severe bleeding, as suggested by the Critical Care society 7
Perform early and repeated hemostasis monitoring, including coagulation studies and platelet count, to manage coagulation abnormalities, as emphasized by the Critical Care society 7
Initiate crystalloid fluid therapy for hypotensive patients, and avoid hypotonic solutions like Ringer's lactate in patients with head trauma, as recommended by the Critical Care society 8

Black widow spider bites, particularly those to the face, require immediate emergency medical care due to the risk of systemic symptoms and proximity to vital structures, according to the American Heart Association, and may cause severe crampy pain, muscle rigidity, diaphoresis, hypertension, and sometimes a visible rash around the bite site, without local tissue injury 2
The American College of Emergency Physicians recommends black widow spider antivenom as the most effective treatment for moderate to severe symptoms, especially with facial involvement, and alternative treatments include IV opioid analgesics combined with benzodiazepines for muscle relaxation 2

Uncomplicated bites may require wound care, including cleaning and dressing the wound, while complicated bites may require surgical debridement and deep irrigation, as recommended by the World Journal of Emergency Surgery 9
Obtain wound cultures to guide antibiotic therapy, especially important in elderly patients who may have colonization with resistant organisms, as suggested by the World Journal of Emergency Surgery 9
Uncomplicated infections may be treated with 3-5 days of antibiotics, while complicated infections require longer courses based on clinical response, as recommended by the World Journal of Emergency Surgery 9