What should I do if I’ve been bitten by lice?
May 17, 2022
Source: Cainiu Health
Dr. Wang Mingxuan
Introduction
Antiallergic and antipruritic medications—such as chlorpheniramine and cetirizine—may be used. Topical ointments are primarily corticosteroid-based, for example, compound flumetasone ointment. If blisters are present, avoid rupturing them whenever possible. For large blisters that interfere with daily activities, aspirate the blister fluid and cover the area to prevent infection. Preventive measures include changing the patient’s undergarments, bed sheets, and blankets.
In daily life, many people experience itching and soreness after being bitten by lice. Scratching the affected areas may lead to widespread infection, significantly disrupting normal daily activities. So, what should you do if bitten by lice?
What should you do if bitten by lice?
Following a lice bite, the skin typically develops red papules of varying sizes—some may evolve into small vesicles, while others form larger ones. Intense itching is common, particularly on the lower legs. Clinically, this presentation is often diagnosed as papular urticaria. For symptomatic relief, antihistamines such as chlorpheniramine and cetirizine may be used. Topical treatment primarily involves corticosteroid ointments—for example, compound flumetasone. If vesicles are present, avoid rupturing them whenever possible. However, if large vesicles interfere with daily activities, the fluid may be carefully aspirated and the area covered with a sterile dressing to prevent secondary infection. Preventive measures include changing the patient’s undergarments, bed sheets, and blankets, and ensuring adequate indoor ventilation.
Lice infestations are classified according to their preferred anatomical site: for instance, body lice (Pediculus humanus corporis) and head lice (Pediculus humanus capitis). Infestations commonly occur due to infrequent hair washing and prolonged exposure to dark, damp environments where lice thrive. Therefore, living spaces should be kept dry, cool, clean, and well-ventilated. Regular hair washing and laundering of clothing—especially undergarments—are essential to prevent infestation. In contrast, pubic lice (“crabs,” Phthirus pubis) are primarily transmitted through sexual contact, most often resulting from unprotected or unhygienic sexual activity. Thus, safe sex practices—including consistent condom use—are strongly recommended. Note, however, that condoms do not fully protect against pubic lice transmission.
Maintaining personal hygiene and ensuring cleanliness of one’s surroundings are crucial to preventing bites from mosquitoes, lice, and other arthropods—which could otherwise lead to fungal or bacterial infections, disrupt daily life, or even trigger dermatological conditions. We hope this information proves helpful!
