Diagnosis: Classic scabies
A 35-year-old male presents with a 2-week history of intense pruritus localized to the finger webs and genital region. Examination reveals erythematous papules and characteristic burrows, indicating a common infestation. This case highlights the clinical features and management of a highly contagious condition.
A 35-year-old male presents with a 2-week history of intense pruritus primarily affecting the finger webs and genital area. On examination, erythematous papules and linear burrows are observed, particularly between the fingers and around the genitalia. The patient reports no significant systemic symptoms but notes increased itching at night.Intense pruritus: Most severe at night, often disrupting sleep.Burrows: Thin, greyish lines visible in the finger webs and genital region.Erythematous papules: Found on the wrists, elbows, and trunk.Secondary excoriations: Due to intense scratching, leading to crusting.Contagion risk: Recent close contact with family members experiencing similar symptoms.
The patient reports that his symptoms began approximately two weeks ago, with no identifiable triggers other than close contact with family members who have been itching. He has not tried any topical treatments prior to this visit. His past medical history is unremarkable, and he has no known drug allergies. He lives in a multi-generational household, increasing the potential for transmission.Onset: Symptoms began 2 weeks ago, initially mild but progressively worsening.Triggers: Close contact with symptomatic family members.Prior treatments: No previous topical or systemic therapies attempted.Social history: Lives in a crowded home environment, facilitating potential spread.Past medical history: No significant health issues or chronic conditions.
Acute / First-Line ManagementPermethrin 5% cream: Apply to all skin surfaces from the neck down and leave on for 8-14 hours, repeat in one week.Ivermectin: Oral dose of 200 mcg/kg as a single dose, may be repeated after one week for extensive infestations.Antihistamines: Oral antihistamines may be used to alleviate itching and improve sleep.Workup and Diagnostic ConfirmationClinical diagnosis: Primarily based on characteristic symptoms and physical examination findings.Skin scraping: Microscopic examination of skin scrapings can confirm the presence of mites or eggs.Family screening: Advise evaluation of close contacts for similar symptoms.Long-Term ManagementEnvironmental measures: Wash all clothing and bedding in hot water and dry on high heat to prevent reinfestation.Follow-up: Schedule a follow-up appointment to assess treatment efficacy and manage persistent symptoms.Education: Educate patients on the life cycle of the mite and the importance of treatment adherence for all household members.
Contact dermatitis: Presents with localized pruritus and erythema, but lacks burrows and is often associated with identifiable allergens.Atopic dermatitis: Chronic pruritus and eczematous lesions may mimic symptoms, but typically involves a broader body distribution.Psoriasis: Characterized by well-defined plaques with silvery scales, differing from the burrows seen in this case.Pediculosis (lice): Intense itching may occur, primarily in hair-bearing areas, with visible lice or nits present.Fungal infections: Tinea may present with itching and scaling, but typically lacks burrows and has distinct borders.Crusted scabies: A severe form that can occur in immunocompromised patients, presenting with widespread lesions but may not initially be suspected.Folliculitis: Can cause pruritus and papules, but lacks the burrow pattern characteristic of scabies.Drug eruptions: Can cause pruritic rashes, but would not typically present with burrows.
High-Yield PearlsBurrows: The presence of burrows in finger webs and genital areas is pathognomonic for scabies.Pruritus: Intense nocturnal pruritus is a hallmark symptom, often leading to significant sleep disruption.Contagion: Scabies is highly contagious; prompt treatment of all close contacts is essential to prevent outbreaks.Environmental control: Washing and drying clothing and bedding at high temperatures is crucial in mitigating reinfestation.Topical vs. systemic therapy: Topical permethrin is the first-line treatment; ivermectin is reserved for extensive cases or in special populations.Timely recognition and treatment of scabies can significantly reduce morbidity and prevent outbreaks.
Tags: scabies, Sarcoptes