ectoparasites
Start with the big picture
Clinically relevant ectoparasites include Sarcoptes scabiei, several human lice, and Cimex lectularius. Infestations can cause pruritic skin changes, and some lice may transmit infections. The lesson organizes treatment by agent, covering permethrin as a first-line topical option, as well as alternatives such as ivermectin, spinosad, benzyl alcohol, malathion, crotamiton, and lindane. Their mechanisms, uses, and important cautions differ. Management also extends beyond medication: itching can continue after successful treatment, while cleaning fomites and treating relevant contacts help address reinfestation. The material provides an introduction to these decisions and the counseling and follow-up considerations involved.
What you'll learn
- Identify common ectoparasites and describe their clinical relevance.
- Compare the roles of first-line and alternative scabies and lice treatments.
- Recognize key safety cautions associated with selected ectoparasiticides.
- Explain why itching may persist after treatment and outline supportive measures.
- Describe approaches to environmental decontamination and contact management.
Continue your study
Work through the complete notes and reinforce the topic with the study tools available in the full lesson.
