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Traumatic Dermatitis Superficial And Deep Folliculitis Furunculosis Pododermatitis Notes

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1. Skin diseases - Pyoderma, Pyotraumatic dermatitis, Superficial and Deep Folliculitis, Furunculosis, Pododermatitis PYODERMA Pyoderma = Pyogenic infection of the skin - generally bacterial but can involve fungi (opportunists)

• Primary Pyoderma - Skin infection what doesn't reoccur after treatment

• Secondary Pyoderma - More common; Assoc. with persistant underlying problems that alter the skins resistance to infection. Usually reoccurs until primary condition is corrected Causal Agents

• Staph. Intermedius (Also Staph. Schleiferi)

• Pseudomonas sp., Proteus sp and E-coli - In chronic, reoccurant or deep pyodermas (as 20 invaders)

• Bacteroides spp, Fusobacterium spp., Clostridium spp. - In deep pyodermas

1. Surface Pyoderma Pyotraumatic Dermatitis = Acute moist dermatitis or "hot spot" Etiology

• Self trauma to the skin due to an underlying pruritic pr painful process → focal surface pyoderma.

• Underlying conditions = Allergic skin diseases, Ectoparasites, Otitis Externa, Environmental causes, Anal Sac issues, Musculoskeletal disorders

• Most common cause is flea allergy dermatitis

Clinical Signs

• Single, alopecic lesion that is well circumscribed, erythematous, thickened and erosive; there is a thin film of exudate on top.

• Lesion devps after licking/chewing and can develop within hours of trauma!
Diagnosis: History of self-trauma, acute onset, rapid development of the lesion, typical appearance on Physical exam Treatment: Topical therapy

• Clip long hairs, Cleanse the area (chlorhexidine)

Dry the lesion and apply topical antibiotic/corticosteroid cream (e.g. panalog cream) Systemic therapy

• Corticosteroids: if the lesion is painful and pruritic

Systemic antibiotics - min. 3 weeks + 1 week after disappearance of clinical signs

Skin fold Pyoderma - Intertrigo Etiology:

• Deep skin folds - Skin rubs against itself)  irritation and trauma  bacterial colonisation of the skin  surface pyoderma

• Skin folds create most dark warm anaerobic conditions for bacteria to flourish. Folds retains skin secretions and skin cells promoting bacterial or yeast growth

• Staph. intermedius and Malassezia pachydermatis - most common Clinical signs:

• Inflammation and mild exudation of the skin fold; malodorous.

Best identified by widening of the skin fold Lip, Facial, Vulvar, Tail, Obesity fold, or Generalized


• Cleanse, disinfect and dry

Bacteria only →2x daily with benzoyl peroxide containing gel Yeast +/- Bacteria → 2X daily miconazole and chlorhexidine containing preparation In the case of sever inflammatory response → 2-3days, 2X dailt panalog cream Preventive therapy: surgical correction by removal of the skin fold

2. Superficial pyoderma

• = Bacterial invasion of the epidermis

2 manifestations: o infection of the stratum corneum and pustule formation = Impetigo or puppy pyoderma o infection of the hair follicle (folliculitis)

Staph. Intermedius is the most common pathogen

Impetigo Etiology:

• Young dogs before puberty

Contributing factors - Poor nutrition, poor environment, ecto or endoparasite infection

Clinical signs:

• Pustules in the inguinal and ventral abdomen regions that DO NOT involve the hair follicles

• When pustules rupture →yellow-brownish crust forms

Usually non-pruritic Usually an incidental finding during exam of newly acquired puppies

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