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Dermatology
Infestations
Built from Dermatology, 5th Edition
What’s inside
7 sections · 90 slides
Overview
- Scope of this topic
Scabies
A pruritic infestation of the epidermis by the host-specific mite Sarcoptes scabiei
- What is scabies
- 150-200M
- Epidemiology
- Scabies mite, eggs, and fecal pellets
- Life cycle of the scabies mite
- Mite biology and incubation
- Classic versus crusted scabies
- Clinical distribution and lesions
- Clinical presentations of scabies in infants
- The burrow: the diagnostic clue
- Crusted scabies presentations
- Confirming the diagnosis
- Microscopy of a scabies skin scraping
- 2020 consensus criteria for diagnosis
- Summary of the 2020 IACS Consensus Criteria for the Diagnosis of Scabies
- Histologic features of scabies
- Differential diagnosis
- Principles of treatment
- Topical and oral treatments for scabies
- Permethrin and spinosad
- Lindane and other alternative agents
- Ivermectin
- Managing scabies in hospital
- Inpatient management of classic scabies and crusted scabies
- Inpatient management of classic scabies and crusted scabies (continued)
- After treatment: postscabetic itch
- Direct microscopy of a scabies skin scraping
- Scabies in infants
- Penile scabies
- Crusted scabies of the ear, scalp, and hands
- Crusted scabies of the periumbilical area and scalp
Head Lice
Pediculosis capitis: a worldwide infestation of the scalp hair by a blood-feeding insect
- What are head lice
- 12M
- Epidemiology
- Head louse family: female, male, and nymph
- Life cycle of the head louse
- Louse biology and transmission
- Head lice nits on hair
- Clinical features
- Differential diagnosis
- Principles of treatment
- Over-the-counter first-line agents
- Prescription agents: malathion, dimethicone, spinosad, abametapir
- Oral ivermectin, benzyl alcohol, and older agents
- Treatments for head lice
Crab Lice
Pthirus pubis: lice of the pubic region and other coarse body hair
- What are crab lice
- Epidemiology
- Adult crab louse anatomy
- Biology and spread across the body
- Crab lice on pubic hair and eyelashes
- Crab lice with follicular erythema
- Considerations and differential diagnosis
- Treatment principles
- Treatments for crab lice
Body Lice
Pediculosis corporis: lice that live in clothing, not on the skin itself
- What are body lice
- Epidemiology
- Diseases spread by the body louse
- Clinical features and transmission
- Body lice eggs in clothing seams
- Differential diagnosis
- Treatment: decontaminating clothing
Tungiasis
Infestation of the skin by the burrowing flea Tunga penetrans
- What is tungiasis
- History and epidemiology
- How the flea burrows and breeds
- Tungiasis in a child
- Clinical course
- Differential diagnosis and impact
- Treatment and prevention
Cutaneous Myiasis
Infestation of the skin by developing fly larvae (maggots)
- What is cutaneous myiasis
- History and epidemiology
- Three clinical patterns of myiasis
- Pathogenesis and transmission
- Life cycle of Dermatobia hominis
- Cutaneous myiasis presentations
- Clinical patterns in detail
- Histopathology of cutaneous myiasis
- Differential diagnosis
- Treatment
- Preventative measures
- Key takeaways
- References
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- References (continued)
- Dermatology, 5th Edition (2-Volume Set)