46. Pyoderma. Demodicosis. Fungal dermatopathies Flashcards
What is pyoderma
a skin disease that is pyogenic
Causes of pyoderma
Coagulase +ve staph
Coagulase -ve staph
Coagulase -ve micrococcus
pseudomonas
proteus vulgaris
e. coli
3 Types of pyoderma
Surface
Superficial
Deep
Surface pyoderma forms
Hotspot form
Intertrigo form
Superficial Pyoderma forms
Impetigo form
Folliculitis form
Deep pyoderma forms
Furunculosis form
cellulitis form
what layer does Surface pyoderma involve
spf horny layer
What is the hotspot form of Surface pyoderma
Acute, moist dermatitis, pyotraumatic dermatitis
Rapid development
Predisposition to hotspot form
Long haired breeds
Hot, humid weather
May be enhanced by self - trauma
Cause of hotspot form
fleas
otitis
paraproctitis
neurosis
allergy
Treatment of hotspot form
eliminated cause
clipping
shampoo
short- term gcc and AB
What is the intertrigo form of Surface pyoderma
anatomical defects
warm, humid,
dark, anaerobic
self trauma
Location of intertrigo form
Lip fold - cocker
facial fold - brachys
vulvar fold - obese, premature spay
tail fold - corkscrew tailed dogs
body fold pyoderma
generalised pyoderma - shar pei
Treatment of intertrigo form
Plastic surrgery
daily cleaning with disinfectants
What is the impetigo form of superficial pyoderma
juvenile pustular dermatitis
puppy pyoderma
non follicular pustule
Predisposed to impetigo form
young puppies prior to puberty
Underlying cause of impetigo form
endoparasites
ectoparasites
poor nutrtion
unhygienic environment
Clinical signs of impetigo form
sub corneal - papule, pustule, yellow crusts
may be asymptomatic
Treatment of impetigo form
Treat underlying cause
Antibacterial shampoos
What is the folliculitis form of superficial pyoderma
Spf folliculitis
bacterial infection at the level of intact hair follicle / epidermis
Predisposed to folliculitis form
young or any age dogs
what is folliculitis secondary to
flea allergy
endocrine disorder
immunosuppression
atopy
parasites
Clinical signs of folliculitis form
Pustules with protruding hair
epidermal collarettes
moth eaten alopecia
papules
crusts
pruritis
Treatment of folliculitis form
treat underlying causes
AB
Deep pyoderma
bacterial infection of the skin beneath the hair follicle involving both dermal and subcuticular tissues
Cause of Deep pyoderma
staphylococcus pseudointermiedius et al
Underlying cause of Deep pyoderma
always present
demodicosis
foreign body
dermatophytes
endocrine
immunodeficiency
Predisposition to nasal pyoderma
Dolichocephalic breeds
Treatment of nasal pyoderma
elizabethan collar
AB
Predisposition to interdigital pyoderma
short coated breeds
causes of interdigital pyoderma
foreign body
demodex
atopy
trauma
Clinical signs of interdigital pyoderma
Swollen feet
alopecia due to licking
paronychia
ulceration
furunculosis
pain
pus
nodules
fistulas
Treatment of interdigital pyoderma
Treat the underlying cause
surgical drainage
footbath with saline
AB
first choice AB for pyoderma
cefalexin
clindamycin
cefadroxil
lincomycin
sulfadimethoxine
AB for pyoderma based on resistance
amoxiclav
marbofloxacin
pradofloxacin
norfloxacin
ciprofloxacin
cefovecin
where are demodex canis present
normal inhabitant of skin & hair follicles
Demodicosis
some dogs become sensitive to the mites due to cellular immunodeficiency
Predisposed to Demodicosis
old english sheep dog
shar pei
g. shepherd
collie
westie
dobermann
3 forms of Demodicosis
Localised - head & fl
Generalised - head, leg, trunk
Pododemodicosis - feet
Localised Demodicosis
patchy alopecia
erythema
scaling –> hyperpigmentation
Generalised Demodicosis
juvenile onset
mainly lesions
secondary pyoderma
Pododemodicosis
thickened skin
hyperpigmentation
secondary pyoderma
oedema
What other disease occurs alongside Demodicosis
otitis externa
Treatment of demodex cati
selamectin
Treatment of Demodicosis
up to 90% of juvenile onset heal spontaneously
small no. of mites - no need for acaricide therapy
Larger infection - shampoo, spot on moxidectin, amitraz laced collar
Treatment of generalised Demodicosis
flushing with amitraz
hair clipping
shampoo with benzoyl - peroxide
PO treatment of generalised Demodicosis
invermectin
doramectin
moxidectin
fluralaner
afoxolaner
sarolander
milbemycin
types of fungal dermatopathies
Superficial mycoses
Subcutaneous mycoses
Systemic mycoses
Types of Superficial mycoses
Dermatophytosis -ringworm
Candidiasis
Malassezia pachydermatitis
cause of dermatopytosis
Microspoum cani, gypseum et persicolor
Clinical signs of dermatopytosis in dogs
Patchy alopecia
folliculitis
plaques
scales
crusts
Clinical signs of dermatopytosis in cats
Cigarette ash
patchy alopecia
miliary dermatitis
crusts
Diagnosis of dermatopytosis
fungal culturing
dermatophyte test medium
wood lamps
KOH preparations
Biopsy
Treatment of dermatopytosis
ketoconazole - systemic and topical
Hair clipping
vaccine
cause of candidiasis
candida albicans
Clinical signs of candidiasis
acute moist dermatitis
Mucosa Ulceration
Grey- white plaques
Vaginal DIscharge
Otitis externa
Skin ulceration
Paronychia
Diagnosis of candidiasis
direct smear
culture
biopsy
Treatment of candidiasis
None licenced in dogs
Topical - miconazole
Systemic - ketoconazole
Malassezia pachydermatitis is usually secondary to
Allergodermatitis
endocrinopathies
pyoderma
demodicosis
Clinical signs of Malassezia pachydermatitis
Alopecia
Pruritis seborrhea
scaling
lichenification
Diagnosis of Malassezia pachydermatitis
Cytology
Treatment of Malassezia pachydermatitis
Eliminate cause
Topical - antifungals
Systemic - ketoconazole
Subcutaenous mycosis
Phytiosis
sporotrichosis
Systemic Mycosis
Cryptococcosis
Clinical signs of Cryptococcosis
nodules
papules
Diagnosis of Cryptococcosis
Biopsy
Culture
Treatment of Cryptococcosis
Surgery
Ketoconazole
Prognosis of Cryptococcosis
Guarded
Systemic treatment of fungal dermatopathies
Itraconazole
Flucanazole
Terbinafin