Dermatology Flashcards
Cutaneous pyoderma
Thickly crusted erosions or ulcerations
Puched out lesions
Occluded footwear
Homeless and solider
Buttocks and LE
Ecthyma
Ecthyma Dx
Culture of staph aureus
Pyoderma that begins with hair follicle
Folliulculitis
Most common etiology of folliculitis
Staph aureus
Small, fragile dome shaped pustule
Superficial folliculitis
Bockhart impetigo
Deep folliculitis on beard area, coalescing
Sycosis barbae
Hot tub folliculis etiology
Pseudomonas aeruginosa
Folliculitis Dx
Clinical signs
Gram stain
Culture
Folliculitis Tx
Warm saline compress
Topical mupirocin, clindamycin
P aeuroginosa folliculitis Tx
Ciprofloxacin
Deep seated inflammatory nodule
Preceding, more superficial evolving into an abscess
Furuncle/boil
Furuncle Etiologic agent
Staph aureus
Deep seated inflm nodule
Multipel sinuses
More extensive
Deeper communicating and infiltrating lesion
Closely set furuncles
Carbuncles
Red and indurated
Multiple pustule
Yellow gray irregular crater
Permanent scar
Carbuncle
Carbuncle predisposing factors:
Obese
Blood dyscrasia
Glucocorticoids
Immunodeficiency
Inflammation of proximal nail fold or eponychium
Paronychia
Paronychia agent
Staph aureus
Paronychia Tx
ID
Mupirocin
Fusidic acid
Dicloxacillin
Well-defined but irregular reddish-brown patches occuring in intertriginous area or fissuing white maceration of toes
Males
Genitocrural area
Erythrasma
Erythrasma etiologic agent
Corynebacterium mutissimum
Erythrasma most common site
Web spaces of feet
Differentiates erythrasma and tinea
Wood’s lamp exam
Erythrasma in Wood’s lamp
Coral fluorescence
Gram + infection with toxin production
Bullous impetigo
Staph scald syndrome
Bullous form impetigo etiologic agent
Staph aureus
Nonbullous form etiology in developing countries
GABHS
More common
Children of all ages and adults
Honey colored crust
Non bullous impetigo contagiosa
Non bullous impetigo contagiosa etiologic agent
S aureus
GABHS
Newborns and young children
Caused by coagulase + staph aureus
Face, trunk, extemities, buttocks, perineum
Ritter disease/Pemphigus neonatorum -extensive
Bullous pemphigus
Impetigo Tx
Mupirocin
Retapamulin
Fusidic acid
Generalized exanthematous disease consisting of cutaneous tenderness and widespread superficial blistering and denudation
Staphylococcus scalded skin syndrome
Fain, orange red macular exanthem or uniform
Erythema sparing mucosal surface
Paper like denudation of skin
Staph Scalded Skin Syndrome
SSSS toxin
Exfoliatin A and B targetting spinosum and granulosum
Very thin walled, flaccid blister
Easily disrupted
Nikolsky sign
+ Nikolsky
SSSS
SJS
TENS
Pemphigus vulgaris
SSSS Tx
Anti staph IV
Mupirocin
Non Necrotizing Dermal infection
Cellulitis
Erisypelas t
Trauma or injury breaking skin
Extends deep to dermis and subcutaneous tissue
Erythema, tenderness
Lack distinct margins between affected and normal skin
Occasionally + crepitus on palpation
Cellulitis
Superficial cutaneous cellulitis
Marked dermal lymphatic involvement
Venous stasis, lymphedema, intertrigo, obesity
Face or le
Demarcates normal skin and lesion
Peau d’ orange
Caused by GABHS
More systemic
Erysipelas
Erysipelas Tx
Penicillin
Amoxicillin
Nec Soft tissue types
Polymicrobial type I
Monomicrobial type II
Polymicrobial infection with mix of anaerobes and facultative species
Peptostrep
Bacteroides
Most common form of Nec Fascitis
Predisposing: surgery, IV drug
Type I polymicrobial
Caused by Group A strep
Hemorrhagic bullae
Flesh eatinf bacteria
Monomicrobial Type II
Flesh eating
Nec Fasc Tx
Surgical exploration
Ampi/Sul
Grouped vesicles
Crusing over the 1/3 of the lower lip
Pain, burning sensation
Occasional pruritus
HSV1
Oral labial herpes
Childhood
Orofacial disease
Painful group vesicles
Central crusting
Red base on shaft of penis
Most prevalent sexually transmitted disease world wide
Most common cause of ulcerative genital disease
HSV 2
Painful grouped, confluent vesicles on base of distal finger
Tzanck smear done with multinucleated giant cells
Herpetic whitlow
HSV 1 and 2
HSV Tx
Acyclovir 200 mg 5x a day
Valacyclovir 1g BID
Petechiae on soft palate
Palpable cervical lymph node
Fever
3 day measles
Inhalation of aerosolized respiratory droplet
Period of infectivity: end of incubation period until disappearance of rash
Exanthema and lymphadenopathy
Rubella
Petechiae on soft palate
Also in infectious mononucleosis
Forccheimer sign
Non pruritic macule and pacule
Beginning on forehead gradually progressing to the neck, trunk and extremities
URTI (high grade fever, cough, coryza and conjunctivitis)
Tiny white lesions surrounded by erythematous halo
Grains of sand over buccal mucosa
Measles
Rubeola
Centrifugal spread
High grade fever preceding rash
+ Koplik spots
Measles Rubeola
Small whitish lesions over buccal mucosa
Koplik spots
Loss of appetite Incessant crying of child upon feeding Few ulcerative oral lesions Painful oral ulcer Linear papulobesicular lesions over sides
Vesicles on hand and foot
Hand foot mouth disease
Coxsackie A
Droplet infection
Fever, chills, malaise, headache, anorexia
Face -> scalp -> trunk
Lesions in all stages are present on the body at the same time
Varicella/Chicken pox
Dewdrops on rosepetals
Erythematous macule
Varicella
Varicela Tx
Acyclovir
Closely grouped vesicles on erythematous base
Dermatomal pattern
Herpes Zoster
Pain >60
Paresthesia
Most common lesion: T3-L2
Herpes zoster
Deep plantar/palmar wart
HPV 1
Wart tx
Salicylic acid
Lactic acid
Trichloroacetic acid
Electrodessication
Small pink pearly or flesh colored dome-shaped papules
Pox virus
Molluscum contagiousum
Molluscum tx
Curettage
Canthardin
Retinoid
Imiquimod
Molluscum pathognomonic for
Henderson Paterson bodies
Honey colored crust mostly around nasal orifice
Non bullous
Bilster and rupture in neonates
Bullous impetigus
