Keratinization disorders MS Flashcards
Causes of seborrhoea
- Idiopathic (cocker, “cradle cup”, H-main/tail)
- Inflammation: vigorous grooming, bact folliculitis, dermatophilosis, dermatophytosis, demodicosis, cheyleetiellosis, lice, Oncocerca, allergies, PF, SLE, drug eruption, Degenerative mucinotic MF, ly MF, concatc dermatitis, sarcoidosis, MEEDS, ETCL
- Endocrine: hypoT, HAC, DM, HyperT
- Nutritional: inadequate, non balanced food, malabsorption, maldigestion, endoparasites, ch catabolic states (H)
- Environmental factors (incerased TEWL): low environmnetal humidity, excessive bathing
DDX for follicular casts
- HAC
- SA
- hypoA
- hyperA
- demodicosis
- follicular dysplasia
Classification of nasodigital hyperkeratosis
- Congential- hereditary
- Idiopathic
- Due to abnormal anatomy
- Secondary
What are presumed causes of idiopathic nasodigital hyperkeratosis
senile changes
+ nasolacrimal duct blockage
+ parasympathetic dysfunction (XEROMYCTERIA)
Name 2nd reasons for nasodigital hyperkeratosis
1) congenital-hereditary disorders of keratinization
2) distemper, papillomavirus (pads)
3) leishmaniosis
4) PF, PE (nasal), drug eruption, DLE (nasal), SLE
5) Zn-responsive, generic dog food
6) MEN
7) cutaneous lymphoma
What are the proposed treatment for nasodigital hyperkeratosis
- Removal of excess keratin (scissors, blade)
- Hydration (water soaks) + keratolytics (petroleum jell, ichthammol oint, propylene glycol, salicylic acid + sodium lactate + urea, tretinoin); Dermoscent Bio Balm (plant oils, allantoin, cetyl palmitate) SID x 2 months was partially effective
- Systemic retinoids (if topical treatment is not possible)
- Fissures: topical antibiotics + glucocorticoids
What are causes of feline acne?
- Poor grooming habits
- Follicular keratinization disorder: seborrheic predisposition, abnormal sebum
- Hair cycle influences
- Stress
- Bacterial: Staphylococcus, Streptococcus, Pasteurella etc.
- Viral: calicivirus
- Fungal: Malassezia
- Immunosuppression
what topical treatments are recommended for feline acne?
- Cleansing: alcohol, human acne cleaning pads, Listerine, veterinary wet wipes, antiseborrheic shampoo (sulphur-salicylic acid, ethyl lactate, benzoyl peroxide)
- Magnesium sulphate: for draining lesions
- Tretinoin or vitamin A 0.05%
- Antibacterials: mupirocin, clindamycin, tetracycline, erythromycin, metronidazole
What are systemic treatemnt for feline acne?
- Antibiotics: amoxicillin-clavulanate, cephalosporin, fluoroquinolone
- Fatty acids: for recurrent cases
- Prednisolone: in severe inflammation
- Isotretinoin: not tolerance or ineffectiveness of topical treatment
What are predisposong factor for canine ear margin seborrhea
-sleeping next to a forced air duct, wood stove or other dry heat sources
DDX for ear margin seborrhoea
- Vasculitis: when heavy crusting, fissures and lesions away from ear margins
- Hypothyroidism
Th for ear margin seborrhea
- Topical shampoo (sulphur-salicylic acid, benzoyl peroxide, benzoyl peroxide + sulphur) followed by moisturizer
- Topical glucocorticoid/ Systemic glucocorticoid
- Surgery (extensive fissures)
Other treatments:
1) pentoxyfylline (response in 1-3 months),
2) fatty acids, vitamin A, zinc (response in 1-2 months)
3) vitamin E, tetracycline, doxycycline, niacinamide
What are the causes of tail gland hyperplasia
- Seborrheic: primary or secondary
- Hyperadrogenism: absolute or relative
- Adrenal tumour/disorder: castrated-males, females
- Hypothyroidism
What are the causes of exfoliative dermatoses
- Bacterial folliculitis
- Dermatophytosis, Malassezia
- Demodicosis, cheyletiellosis, scabies
- FeLV, FIV, leishmaniosis
- PF, SLE, drug eruption, physiologic response to drugs, EM, TEN
- Ichthyosis
- Contact dermatitis
- Causes of cutaneous flushing (mast cell tumour, systemic mastocytosis, pheochromocytoma, carcinoid syndrome, thallium toxicosis)
- Parapsoriasis, thymoma
- Epitheliotropic lymphoma
- Idiopathic ( like in cats without thymoma)
Physiologic response to drugs and exfoliation
- Drugs used to treat surface or superficial follicular disorders: exfoliation due to involution of the underlying skin disease
- Cytotoxic agents: exfoliation after treatment termination
- Hormones: exfoliation 1) after termination of chronic moderate-high dose glucocorticoids or during medical treatment of HAC; 2) first few weeks of T4
- Retinoic acids