Derm Flashcards
Shingles
Due to: Varicella ZOSTER virus
Presents:
- Neuralgic “tingly” pain greater with age
- Erythema
- Common in elderly/ immunocompromised
- Dermatomal
If pain presents more than 4 weeks then it’s known as Post Herpetic neuralgia
Oral Aciclovir
VZV used in chickenpox vaccine can be used in elderly to reduce shingles risk by 36% and Post Herpetic neuralgia by 67%
Chickenpox
Due to: VARICELLA zoster virus
Presents:
- Generalised rash and fever
- Sensory nerve roots
Supportive
Live attenuated vaccine is available for chickenpox (not widely used in UK)
Neonatal VZV
Secondary to chickenpox in mother in a late pregnancy
Prevention with Varicella Zoster Immunoglobulin in susceptible women
Ramsay-Hunt Syndrome
Presents:
- pain in vesicles, auditory canal and throat
7th CN - facial pasly
8th CN- deafness, vertigo, tinnitus
Aciclovir
Herpes Simplex Type 1
Presents:
- Primary gingivostomatitis
- Pre-school children
- Extensive ulceration in and around mouth
- Lasts around a week
- 50% Genital herpes
MIld: Supportive
Severe: Aciclovir
Cold sore: Topical antiviral
Herpes Simplex Type 2
Presents:
- 50% Genital herpes - warts
- Some Gingivostomatitis
- Encephalitis (common in neonates)
Aciclovir <72hours
Human Papilloma Virus
Presents:
T1-4: Warts/ verrucas
T6 &11: Genital warts
T16 & 18: Cervical cancer
Gardasil vaccine: protects against T6, 11, 16; 18
Cervarix vaccine: protects against T16 & 18
Herpangina
Due to enterovirus (coxsackie and echovirus)
Presents:
- Blistering rash at the back of the mouth
Self-limiting
Rubella
Vaccination
Erythema infectiosum / “Slapped cheek disease”
Caused by: Erythrovirus (Parvovirus B19)
Child: crash on face, lacy rash on body
Adult: polyarthritis in joints/ hands, no rash
Self limiting
Reassure patient
Symptomatic relief with over-counter meds
Orf
Due to virus caught from sheep with scabby mouths (ikr wtf)
Presents:
- Firm, fleshy nodule on hand of farmer
Self-limiting
Syphilis
Due to: bacterium Treponema pallidum
Presents:
Primary- Chancre (painless ulcer) at infection site
Secondary- red rash over body especially palms and soles, mucous membrane “snail track” ulcers
Tertiary: CNS, Cardiovascular
Penicillin G injections
Lyme disease
Due to: Borrelia burgdorferi from ticks
Presents:
Early- erythema migrans
Late- heart block, nerve palsies, arthritis
Amoxicillin or Doxycycline
Scabies
Caused by “Sarcoptes scabiei”
Chronic crusted form is termed “Norwegian Scabies” adn is highly infectious.
Associated with an intensely itchy rash affecting finger-webs, wrists and genital area
Malathion lotion Benzyl benzoate (avoid in children)
Erythropoietic protoporphyria
6 monthly LFTs and RBC porphyrins
Photoprotection measures
- Prophylactic TL-01 phototherapy
- Anti-oxidants: beta-carotene, cysteine, high dose Vitamin C
- Avoid iron
If leads to liver failure:
- oral charcoal
- cholestyramine
- ALA synthase inhibition
Prophyria cutanea tarda
Presents as: Blisters, fragility Hyperpigmentation Hypertrichosis Solar urticaria Morphoea
Treat underlying disease:
- Alcohol
- Viral Hepatitis
- Oestrogens
- Haemochromatosis
Not doing this will lead to risk of liver cirrhosis/ hepatoma
Atopic Eczema
- Emollients
- Topical steroid (hydrocortisone)
- Phototherapy UVB
- Systemic Immunosuppressants
- Biologics
Treat infections as necessary
Avoid irritants
Pruritus (itching)
- Sedative Anti-histamines
- Emollients: Menthol (Dermacool), Capsaicin, Camphor, Phenol, Crotamiton (Eurax cream)
- Antidepressants, e.g. doxepin
- Phototherapy
- Opiate antagonists, ondansetron
- Treat underlying disease
Dry skin
Moisturising agents
Viral Warts / verrucas
Self limiting Keratolytic agents (salicylic acid) Formaldehyde Glutaraldehyde Silver nitrate Cryotherapy (liquid nitrogen)
Anaphylaxis
Adults: 300µg adrenaline
Children: 150µg adrenaline
Contact dermatitis
A non-immunological process where contact with agents that abrade, irritate and traumatize skin directly.
Examples:
- Nickel in belt buckle
- Latex/ thiuram in rubber gloves
- Colophony in elastoplast
- Fragrance in deodorants
- Chromate in footwear
- Garlic
- PPD in black henna tattoo
- Diethylthiourea in wrist splint
- Dermabond surgical glue
- English Ivy
- Golden fillings etc
- Nappy rash
- Licking lips
Remove the irritant
Lichen Planus (non-infective inflammatory dermatoses)
Mild: Topical corticosteroid (potent/ very potent)
Severe: Oral steroids
Keloid scars
Topical corticosteroid
Eczema Herpeticulum
Oral antiviral
Candida intertrigo (infection)
Nystatin (oral)
Clotrimazole cream
Oral fluconazole
Hyperkeratotic Eczema
Keratolytic agents (salicylic acid)