Adult Dermatology Flashcards
Rectangular/polygonal lichenfied patches
Lichen simplex chronicus
Velvety, warty surface with “stuck on” appearance
Seborrheic keratosis
Silvery scales on bright red, well-demarcated plaques
Psoriasis
Satellite pustules
Tinea intertrigo
“Herald” patch, with “Christmas tree” rash eruption on trunk
Pityriasis rosea
white, curd-like plaques on the oral mucosa and tongue
oral moniliasis (thrush)
Beefy red, well-circumscribed patches
Tinea intertrigo
Cracking/maceration between toes
Tinea pedis
Scaling on lateral edges of feet
Tinea pedis
Circular patches of fine scale, hair loss, “black dot”
Tinea capitis
Fine “powdery” scales
Tinea versicolor
KOH –> “spaghetti & meatballs”
Tinea versicolor
Resistant to griseofulvin
Tinea versicolor
Honey colored crusts
Impetigo
Slightly elevated, hardened red lesion that is well circumscribed
Legs are the most common site
Erysipelas
Changing mole
Malignant melanoma
Red man syndrome
CTCL, psoriasis, atopic dermatitis, contact dermatitis
Flexural surfaces, not well demarcated
Atopic dermatitis
round, oval plaques with a red,scaly leading edge
tinea corporis
treatment is oral griseofulvin (with dairy)
tinea capitis
dome shaped papule with central umbilication
viral cause - molluscum contagiosum
grouped vesicles on an erythematous base
herpes simplex (I or II)
vesicular eruption in a unilateral, dermatomal pattern
varicella zoster
Metastasis is rare in this form of skin cancer.
Basal Cell Carcinoma
pearly/waxy border with arborizing vessels
BCC
cigarette paper scale
CTCL
Sezary cells
CTCL
erysipelas can be treated with what antibiotic?
penicillin
Cellulitis associated with a wound - what is the most likely causative organism?
Staph aureas
Cellulitis that is diffuse and fiery red - what is the likely causative organism?
Strep
Treatment for mild and severe cellulitis
Mild - oral therapy (purulent and non-purulent) antibiotics. Severe - IV therapy - consider MRSA - give a beta-lactam for non-purulent cellulitis
painful, tender, fluctuant nodules - skin abscess - causative organism?
S. aureus - community associated MRSA
presence of pus within muscle groups
pyomyositis - usually S. aureus
Causative organism of Monomicrobial Necrotizing Fasciitis
GAS, or S. aureus
Necrotizing fasciitis - saltwater exposure
Vibrio vulnificus
Necrotizing fasciitis - freshwater exposure
Aeromonas hydrophila
Most likely causative organism of gas gangrene (myonecrosis)?
Clostridium sp.
Causative agent of Fournier Gangrene? Describe the disease, and underlying aspects.
Mixed flora. Gangrenous necrosis of scrotum, penis, or vulva. Usually patients have underlying disease (diabetes). Treat with aggressive surgical debridement and antibiotics.
Classic causative organism of infection from a cat bite?
Pasteurella
Classic causative organism of infection from a dog bite?
Capnocytophaga
Ulceroglandular form with eschar
Tularemia “rabbit fever” - Francisella tularensis
Bubo with erythema of overlying skin
Bubonic plague - Yersinia pestis
Painless necrotic ulcer with central eschar, surrounding edema.
Anthrax, Bacillus anthracis
“Fish tank granuloma”
Mycobacterium marinum.
Plugged pores –> papules –> pustules –> cysts –> scars
Acne vulgaris
open comedone
blackhead
What is the role of Retinoic acid in the treatment of acne?
Comedolytic, and anti inflammatory role. Treating mild-moderate acne.
What is the role of antiseptics in acne treatment?
Effective antibacterial agent, and comedolytic. Used in inflammatory and comedonal acne.
Treatment for Grade 1 acne.
Superficial, noninflammatory, comedones. Tx - Benzoyl peroxide and topical retinoids.
Tx for Grade 2 Acne.
Superficial - inflammatory papules, pustules. Tx - topical antibiotics, topical retinoids, salicyclic acid, benzoyl peroxide
Tx for Grade 3 acne.
Palpable deep inflammatory lesions (nodules & cysts). Tx - intralesional corticosteroid injections, hormonal therapy for women, severe - Isotretinoin (Accutane)
Tx for Grade 4 acne
Nodular, cystic acne. High risk for scarring. Tx - Accutaine, androgen blockers for women, intralesional corticosteroids, possible incision and drainage.
History of flushing, presence of telangiectansias, affecting the central face. Adults 30-50+ years.
Rosacea
Papular, erythematous eruptions around the mouth.
Perioral dermatitis
Neutropenia or colonic lesions - gas gangrene that takes place in the absence of trauma. Causative organism and treatment.
Clostridium septicum. Penicillin + clindamycin
When examining a patient who has “fight bite”, what organism do you need to have special considerations for treatment?
Eikenella - human mouth flora. Also keep HIV, Hepatitis B & C in mind.
A patient has a new kitten and got bit. What is the causative organism of the rash they’ve developed?
Cat-scratch. Bartonella henselae
Exscoraiation so with small pruritic vesicles, pustules, and short irregular marks. First presented in between the digits then spread to the extremities, umbilicus, axilla…
Scabies. DDx - Pedculosis and other pruritic rashes.
Glove and stocking appearance, symmetric anthralgias, anemia.
Fifth Disease in an adult. Parvovirus B19.
“Valley Fever” - Causative organism?
Coccidoidomycosis - fungal
Central face flushing (without emotional stimuli). Telangiectasias.
Rosacea
Rhinophyma - a progression of this disease, typically occurs in men
Rosacea
DDx of Rosacea
Check for other ssx. Carcinoid syndrome, seborrheic dermatitis, perioral dermatitis, lupus erythematosis.
Rosacea tx
anti-mite treatment, oral antibiotics depending on severity. Anti-redness creams.
Pink, scaly plaques, poorly circumscribed. Mostly on hair-bearing areas. Scalp and face dandruff.
Seborrheic dermatitis
Flesh colored, soft, rubbery, sometimes lobulated, mobile when palpated
Lipoma
Highly vascularized papule red or purple in color, grows rapidly and bleeds easily, often occurs at sites of trauma or infection
Pyogenic granuloma
Sign of Lesser Trelat
Acute onset of many seborrheic keratoses
Skin tags
Acrochordon
Soft, red, compressible papules that blanche
Hemangioma
Causative agent of molluscum contagiosum.
Pox virus
Oil glands seen typically royally areas of face, yellow papules with central dell
Sebaceous hyperplasia