Dermatology Lecture 5

Question 1

What are the two main causes of alopecia?

Answer 1

Alopecia can be differentiated into two main categories: - excessive hair loss (mostly inflammatory) - inadequate production of hair

Question 2

How can a trichogram be used to differentiate between the cause of allopecia?

Answer 2

Is animal is pruritic - the tips of the hair will probably be broken off - if the hair is falling out for any other reason the tips of hair will be tapered (normal)

Question 3

Describe how a diagnosis of inflammatory alopica (folliculitis) can be made:

Answer 3

1. Look for the presence of inflammation and/or primary lesions such as papules or pustules, scale and crust, epidermal collaretes
2. Pattern of hair loss - patchy, focal-to-mutlifocal (“moth eaten”) alopecia
3. Pattern of hair loss - long haired animals - increased shedding + dull hair coat

Question 4

Briefly explain how furunculosis will appear:

Answer 4

• When furunculosis develops - entire follicular wall is destroyed - erythematous nodule in dermis - associated with hair loss

Question 5

Name the conditon that is shown below:

Answer 5

Furunculosis

Question 6

Name the lesion that is shown below:

Answer 6

Bacterial folliculitis

Question 7

What is deep bacterial folliculitis and what is a potential sequaelae to it?

Answer 7

• Inflammation of entire hair follicle w/or without furunculosis
• Deep follicular inflammation leads rupture of hair follicle + granulomatous foreign body response

Question 8

Name the lesion that is shown below:

Answer 8

Bacterial folliculitis

Question 9

What is dermatophysis?

Answer 9

Dermatophysis - superficial infection of hair, skin + nails - results in alopecia, scale, crust and erythema

Question 10

What is the cause of dermatophytosis?

Answer 10

Direct transmission of fungal spores to the host

Question 11

What is follicular dystrophy and when is it likely to be apparent?

Answer 11

• Follicular dysplasia - abnormal hair shafts and/or hair follicle malformation - altered hair quality and alopecia
• Clinical signs are likely to be present during the anagen phase