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Terms in this set (48)
What is hidradenitis suppurativa?
Chronic follicular occlusion and apocrine gland inflammation.
What does the exotoxin in clostridium tetani do?
Blocks inhibitory (GABA) neurotransmitters.
What is the most common cause of necrotizing fascitis?
Group A strep
What are the guidelines for tetanus in a person with a recent nail puncture wound?
>3 known Td doses-no TIG or Td vaccine.
<3 doses, unknown or >10 years since booster; clean wound give Td, dirty wound give Td and TIG
What is the cause of impetigo?
S aureus (erythematous vesicles) or GAS (erythematous pustules).
What is the progression for treating acne?
Topical benzoyl peroxide-->topical retinoid-->topical abx-->oral abx-->oral retinoid
What are some side effects of isotretinoin?
Teratogenic, hepatic damage and associated with IIH (pseudotumor cerebri). Women must have 2 negative pregnancy tests before it is prescribed.
What is rhinophyma?
Severe case of rosacea-->bulbous appearance of the nose. Treat with topical metrinidazole and systemic tetracycline for maintenance.
What is the cause of the lesion? Single, painless lesion, clean base.
What is the cause of the lesion? Multiple, painful, grouped vesicles with painful LAN.
What is the cause of the lesion? Single, painful, purulent vesicle with shaggy border with painful fluctuant LAN?
Chancroid (H ducreyi)
What is the cause of the lesion? Single, painless papule with painful LAN 3 weeks later.
What is the cause of the lesion? Painless nodule(s) with associated psuedobubos.
What is the confirmatory test for HSV?
What is the treatment for a pregnant non-immune patient that contracts varicella?
Varicella immune globulin
What is the cause of mollucum contagiosum?
What is the treatment for scabies?
Permethrin cream, diphenhydramine to relieve pruritis
What type of hypersensitivity is scabies?
Scaling lesions present on back and chest, varying in color. Think of what? Order what? Treatment?
Tinea versicolor, KOH prep-->spaghetti and meatballs. Treat with selenium sulfide
Pruritic, erythematous, scaly plaques with central clearing. Think of what? Treatment?
Microsporum, trichophyton, epidermophyton. Name depends on location. KOH-->hypahe. Topical antifungal except capitis and unguinum, treat with oral griseofulvin.
KOH showing pseudohypahe.
What is deficient in albinism?
What are some examples of the 4 different hypersensitivity reactions?
I-Asthma, anaphylaxis, urticaria
III-SLE, arthrus reaction, serum sickness
IV-Contact dermatitis, TB
What is the cause of hereditary angioedemaib?
CI esterase inhibitor deficiency
Rash on palms and soles, think of what?
Erythema multiforme, secondary syphilis
Erythema multiforme may be associated with what infections?
HSV and mycoplasma
What is the difference between seborrheic keratosis and actinic keratosis?
Seborrheic is a non malignant lesion commonly found in the elderly that appears stuck on and greasy. Actinic keratosis is a pre-malignant lesion to SCC associated with sun exposure.
What is seborrheic dermatitis?
Hyperproliferation of the epidermis seen most commonly on the scalp-->dandruff.
What is the name for seborrheic dermatitis in infants?
What is atopic dermatitis?
What is the only skin condition that can be treated with UV light?
What is ichthyosis vulgaris?
Patients have a history of normal skin at birth with progression to dry, scaly skin with horny patches over the extensor surfaces. Worsens in the winter.
Single round lesion up to 5 cm in diameter followed by an eruption of pruritic, oval, erythematous papules on the chest, back and extremities. Think of what?
Patient recently got a new watch and now has a rash on his wrist. Think of what?
Contact dermatitis, type IV hypersensitivity
What is Behcet's disease?
Recurrent oral ulcers, genital ulcers and uveitis. Sometimes accompanied by erythema nodosum.
What conditions are associated with erythema nodosum?
Strep, syphilis, TB, sarcoidosis, IBD, pregnancy, drugs (OCPS, sulfa, amiodarone)
What is pemphigus vulgaris?
Ab against desmosomes-->thin-walled blisters in the oropharynx, chest, face. Positive Nikolsky sign. Biopsy shows an intact basement membrane and tombstoning.
What is bullous pemphigoid?
Ab against hemidesmosome-->thick-walled blisters, widespread.
What is prophyria cutanea tarda? Treatment?
Deficiency of hepatic uroporphyrinogen decarboxylase-->chronic blistering on sun-exposed skin, elevated AST, ALT and plasma porphyrin. Treat with periodic phlebotomy
What is the treatment for actinic keratosis?
5-FU or imoquimod
What is Bown's disease?
SC CIS, must be resected
What is keratocanthoma?
Looks very similar to SCC but it will have a history of coming and going on it's own. Still biopsy and resect.
Painless, erythemarous papule with scaling that may bleed or ulcerate?
Pearly, pink, papule with fine vascular markings?
What is the most common type of skin cancer?
What is the most important prognostic factor of melanoma?
Thickness, >0.76mm-->increased risk of mets
What is allopecia arreata?
Autoimmune against hair follicles, completely hariless
How to differentiate traction allopecia from trichotillomania?
Traction allopecia-->permanent damage to hair follices whereas trichotillomania does not. So in trichotillomania you will see hair at different lengths of regrowth.
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