Diseases of skin Flashcards
skin diseases can be classified by
clinical signs
aetoiology
skin diseases by clinical signs
- Pruritus
- Alopecia
- Nodular diseases
- Scaling and crusting diseases
- Changes of pigmentation
parasitic skin disorders
- Mange (Sarcoptes, Psorptes, Chorioptes)
- Habronema
- Oxyuris equi
- Onchocerca cervicalis ( Nuchal ligament)
- Microfilariae
- Hypersensitivity
- Ivermectin
fungal skin disorders
Dermatophytosis/Ringworm
Histoplasma farciminosum - epizootic lymphagitis
ringworm
o Trichophyton, Microsporum
o Most common
o Contagious, zoonosis
o Papular then crusted, spread circumferentially, alopecia, scaling
o Contact sites
o Culture, biopsy
bacterial skin diseases
- Dermatophilosis/rain scald
- Dermatophilus congolensis
- staph
- strep
viral skin disorders
-EHV-3
- Vesicular stomatitis (Americas)
- Horse pox
- Molluscum contagiosum
allergic skin disorders
- Eosinophil granuloma
- Urticaria
- IBH (insect bite hypersensitivity)
- Food allergy
- Contact allergy
- Drug allergy
- Atopic dermatitis
eosinophilic granuloma
unknown aetiology (collagen degeneration)
lesions
o Multifactoral o IBD o Atopic dermatitis o Trauma
urticaria
aetiology
type I hypersensitivity
o inhaled allergens
o Serum products, blood transfusion
o Antibiotics (drug allergy)
o Food allergy (oat allergy)
o Chronic, purulent (infectious) diseases
o Insect bite (local allergic reaction, +/- anaphylactic reaction)
urticaria
clinical signs
o Within minutes or hours
o Papules, coalescing, wheals, larger oedemas
urticaria
diagnosis
o Sigs + allergen load
o Elimination of allergens (5-7 days)
o Allergic skin tests
urticaria
clinical course
o Usually fast healing
o Purpura haemorrhagica or chronic recurrent allergic dermatitis may develop
insect bite hypersensitivity
sweet itch
- Seasonal
- Pruritus
- Broken mane and tail hair, alopecia
- Erosions, papules, crusts
- Ventral midline dermatitis
drug allergy hypersensitivity
type I, II, III, IV
food allergy hypersensitivity
type I, II, IV
autoimmune skin disorders
- Pemphigus foliaceus
- Bullous pemphigoid
- Systemic lupus erythematosus like disease
- Discoid lups erythematosus
skin neoplasia
- Papillomatosis
- Sarcoid
- Melanoma
- Squamous cell carcinoma
antiseptics
Chlorhexidine
Povidone
Hydrogen peroxide
chlorhexidine
No absorption
broad spec antibacteria
weak fungicide
pus doesnt decrease it affect
use water for dilution not saline
Povidone
broad spec virucide, bactericide, fungicide
pus doesnt decrease it affect
better at lower conc
<0.05% concentration: minimal tissue damage
≥ 5% concentration: inhibits WBC migration to wounds
Hydrogen peroxide
weak germicide
for deep, anaerobic infections
>5% concentration: more tissue damage than bactericide effect
It may cause microvascular thrombosis, and delay wound healing
