Page 1327 - Problem-Based Feline Medicine

65 – THE CAT WITH ABNORMAL EYELID APPEARANCE 1319

● Malasezzia (p 1327)
Alopecia and crusting of peri-ocular skin.
Parasitic:
● Demodecosis (p 1327)
Peri-ocular alopecia, erythema, scaling with variable pruritis.
● Notoedres cati* (p 1327)
Alopecia with pronounced pruritis, crusting and excoriation of the ears, eyelids face and neck.
● Parasitic myiasis (p @)
Fistulous opening with larvae visible in wound.
Inflammation/non-infectious:
● Solar dermatitis** (p 1329)
Erythema and crusting, with or without hemorrhage usually involving non-pigmented eyelid skin.
● Allergic blepharitis** (p 1325)
Associated with food allergy, atopy, insect bite hypersensitivity, staphylococcal allergy, or contact
allergy to topical drugs. Variable erythema, swelling, pruritis, excoriation, exudation and crusting
of eyelid skin.
Immune-mediated:
● Pemphigus foliaceous, pemphigus erythematosus, systemic lupus erythematosus (p 1328)
Alopecia, erythema, scaling and crusting of the eyelids additionally affecting nailbeds, nipples
(foliaceous) and ears, muzzle and nose (erythematosus). Uncommon. Other immune-mediated
disease (e.g. immune-mediated polyarthritis, glomerulo-nephritis) is present in SLE.
Trauma:
● Eyelid trauma/wounds* (p 1326)
Visible tears in the eyelid skin or discontinuities at the eyelid margin with loss of normal function.
Discharge ranges from hemorrhagic, serous or purulent, depending on duration.

INTRODUCTION
process affects the eyelid skin, the eyelid margin or the
palpebral conjunctiva. Sometimes multiple tissues may
MECHANISM?
be affected within the eyelid. Occasionally an eyelid
may appear abnormal because of a neurological
Basic pathological mechanisms underlying an abnor-
process occurring distant to the eye.
mal eyelid appearance include failure of embryonic
tissues to differentiate or rarify, inflammation, neopla- Altered eyelid function or structure may affect adja-
sia, trauma and neurological disease. cent or remote structures, for example:
● Entropion or eyelid agenesis may cause corneal
WHERE? disease due to lack of a normal anatomical relation-
ship between the eyelid and the cornea.
The location of disease processes within the eyelid can ● Immune-mediated, allergic or parasitic skin disease
often be simply described according to whether the may affect skin remote from the eyelid.