Dermatology Flashcards
What is eczema
Chronic atopic condition
Inflammation in skin
Tends to run in families
Usually presents in infancy
How might a patient with eczema present
Dry, red, itchy, sore patches of skin
On flexor surfaces, face, and neck
What is the maintenance management for eczema
Emollients (artificial barrier over skin)
Soap substitutes
Avoid environmental triggers
What is the management for eczema flares
Thicker emollients
Topical steroids
Antibiotics (rarely needed)
Zinc impregnated bandages
Phototherapy
Systemic immunosuppressants (corticosteroids, methotrexate)
What is eczema herpecticum
Viral infection of skin
Due to: herpes simplex, varicella zoster
How might a patient with eczema herpecticum present
Widespread, painful, vesicular rash
Fever
Lethargy
Irritability
Reduced oral intake
Lymphadenopathy
What are the investigations for eczema herpecticum
Viral swab of vesicles
What is the management for eczema herpecticum
Aciclovir (IV in severe cases)
What are the complications of eczema herpecticum
Can be life threatening if not treated properly
Can get bacterial superinfection
What is psoriasis
Chronic autoimmune condition
Recurrent psoriatic skin lesions
Skin dry, flaky, scaly, slightly erythematous
Raised and rough plaques
Over extensor surfaces
Due to rapid generation of new skin cells
What are the types of psoriasis
Plaque (most common form)
Guttate (mostly in children, triggered by strep throat infection)
Pustular (can be systemically unwell, medical emergency)
Erythrodermic (skin can come away in large patches, medical emergency)
How might a patient with psoriasis present
Auspitz sign: small points of bleeding when plaques scraped off
Koebner phenomenon: psoriatic lesions to areas of skin affected by trauma
Residual pigmentation (after lesions resolve)
What is the management for psoriasis
Topical steroids
Topical vitamin D analogues
Topical dithranol
Phototherapy
Systemic treatment (methotrexate, cyclosporin)
What are the complications of psoriasis
Nail psoriasis (pitting, thickening, discolouration, ridging, separation from bed)
Psoriatic arthritis
What is acne vulgaris
During puberty and adolescence
Chronic inflammation of pilosebaceous units under skin
Due to: increased production of sebum, trapping of keratin, blockage of pilosebaceous unit
Exacerbated by androgenic hormones
How might a patient with acne vulgaris present
Macules (flat marks on skin)
Papules (small lumps on skin)
Pustules (small lumps containing yellow pus)
Comedones (blocked pilosebaceous units)
Black heads (open comedones with black pigmentation)
What is the management for acne vulgaris
Topical benzoyl peroxide (reduced inflammation, unblocks skin)
Topical retinoids (slow production of sebum, highly teratogenic)
Topical/oral antibiotics
COCP
What is first disease
Measles
Highly contagious
Symptoms 10-12 days after exposure
Presentation: fever, coryza, conjunctivitis, koplik spots (grey white spots on buccal mucosa)
Rash starts on face, spreads to rest of the body
Self resolves in 7-10 days
Notifiable disease
Complications: pneumonia, diarrhoea, dehydration, encephalitis, meningitis, hearing loss, death
What is 2nd disease
Scarlet fever
Due to group A strep
Pink, blotchy, macular rash
Rough ‘sandpaper’ skin
Starts on trunk, spreads outwards
Presentation: fever, lethargy, flushed face, sore throat, strawberry tongue, cervical lymphadenopathy
Antibiotics (penicillin V)
Notifiable disease
What is 3rd disease
Rubella
2 week incubation
Erythematous, macular rash
Starts on face, spreads to body
Presentation: mild fever, joint pains, sore throat, lymphadenopathy
Notifiable disease
Should stay off school for 5 days from rash starting, and away from pregnant women
Complications: thrombocytopenia, encephalitis, congenital rubella syndrome (deafness, blindness, congenital heart disease)
What is 4th disease
Duke’s disease
Non-specific viral rash
What is 5th disease
Slapped cheek syndrome
Parvovirus B19 infection
Affects trunk and limbs
Self resolves in 1-2 weeks
Complications: aplastic anaemia, encephalitis, meningitis, pregnancy complications, hepatitis, myocarditis, nephritis
What is 6th disease
Roseola infantum
Due to herpesvirus 6
1-2 week incubation
High fever for 3-5 days, disappears suddenly
Coryzal symptoms
Rash 1-2 days after fever
Rash on arms, legs, face, trunk (not itchy)
Fully recover in a week
Complications: febrile convulsions
What is erythema multiforme
Erythematous rash due to hypersensitivity reaction
Mostly due to viruses or medications
How might a patient with erythema multiforme present
Widespread, itchy, erythematous rash
Characteristic target lesions
Can cause stomatitis
Mild fever
Muscle and joint pains
Headache
Flu-like symptoms
What is the management for erythema multiforme
Resolves spontaneously in 1-4 weeks
If severe: IV fluids, analgesia, steroids
What is urticaria
Aka hives
Small, itchy lumps on skin
Can be associated with angioedema and flushed skin
Due to release of histamines by mast cells
Can be acute or chronic
What are the causes of urticaria
Food allergies
Medication allergies
Animal allergies
Contact with chemicals
Viral infections
Insect bites