Lichen Simplex Chronicus in Scabies: Diagnosis and Treatment

Introduction to Scabies and Lichen Simplex Chronicus

Scabies is a parasitic infestation caused by the mite Sarcoptes scabiei, typically treated with permethrin 5% cream or oral ivermectin, as recommended by clinical guidelines 1, 2

Scabies diagnosis focuses on identifying the mite, eggs, or fecal matter in skin scrapings, while LSC is a clinical diagnosis based on the characteristic appearance of lichenified skin 1

First-line treatment for scabies infestation includes permethrin 5% cream applied to all areas of the body from neck down and washed off after 8-14 hours, or oral ivermectin 200 μg/kg, repeated in 2 weeks, as per clinical guidelines 1, 2
Topical ultrapotent corticosteroids are the first-line treatment for LSC, as recommended by the British Journal of Dermatology 3
Treatment for LSC should continue until clinical improvement of the lichenified areas, according to the British Journal of Dermatology 4

Not treating all close contacts for scabies simultaneously can lead to reinfestation and persistent symptoms, highlighting the importance of simultaneous treatment 1, 2
Pruritus from scabies may persist for up to 2 weeks after successful treatment, and LSC changes may take longer to resolve, even after the scabies infestation is cleared 1, 2
Consider retreatment for scabies if symptoms persist beyond 2 weeks or if live mites are observed, as advised by clinical guidelines 1, 2
Long-term follow-up may be necessary for patients with persistent LSC despite successful scabies treatment, as suggested by the British Journal of Dermatology 4