Eyelash lice (phthiriasis palpebrarum) is infestation of the eyelid margin by lice and requires targeted topical treatment. Agent selection for first-line therapy is not interchangeable — safety profiles and clinical suitability vary, including considerations around pregnancy.
First-line management uses a topical pediculicidal lotion applied to the affected area and left in place before washing off. Not all available agents are appropriate as initial therapy — some are restricted due to toxicity concerns. The complete regimen, full agent selection, and application guidance are in the structured protocol.