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| **Horses - loss of main and tail hair, deformed hooves that may be shed | | **Horses - loss of main and tail hair, deformed hooves that may be shed |
| ==Physical damage== | | ==Physical damage== |
| + | |
| ===Acral lick dermatitis=== | | ===Acral lick dermatitis=== |
| *Also called '''lick granuloma''' or '''neurodermatitis''' | | *Also called '''lick granuloma''' or '''neurodermatitis''' |
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| **Perivascular and periadnexal plasma cell accumulation | | **Perivascular and periadnexal plasma cell accumulation |
| **May be associated with mild snsory polyneuropathy | | **May be associated with mild snsory polyneuropathy |
− | ===Feline psychogenic alopecia===
| + | |
− | *Occurs in cats
| |
− | *Broken hairs cused by persistent licking -> partial alopecia
| |
− | *Areas mostly affected: dorsal midline, perineal, genital, medial thigh, abdomen
| |
− | *Microscopically:
| |
− | **Usually normal skin
| |
− | **Possibly increased [[Skin Glossary - Pathology|telogen]] follicles
| |
| ===Callus=== | | ===Callus=== |
| *Hypertrophy of epidermis, particularly at pressure points | | *Hypertrophy of epidermis, particularly at pressure points |
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| **[[Skin Glossary - Pathology|Comedones]] and follicular cysts may be present, potentially rupture and cause secondary pyoderma | | **[[Skin Glossary - Pathology|Comedones]] and follicular cysts may be present, potentially rupture and cause secondary pyoderma |
| **Excessive keratin widening follicular openings | | **Excessive keratin widening follicular openings |
| + | |
| + | ===Feline psychogenic alopecia=== |
| + | *Occurs in cats |
| + | *Broken hairs cused by persistent licking -> partial alopecia |
| + | *Areas mostly affected: dorsal midline, perineal, genital, medial thigh, abdomen |
| + | *Microscopically: |
| + | **Usually normal skin |
| + | **Possibly increased [[Skin Glossary - Pathology|telogen]] follicles |
| + | |
| ===Injection site reaction=== | | ===Injection site reaction=== |
| *May be caused by subcutaneous injections | | *May be caused by subcutaneous injections |
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| *Cats may develop fibrosarcomas secondary to vaccination | | *Cats may develop fibrosarcomas secondary to vaccination |
| *Dogs, especially poodles, may develop lymphoplasmacytic panniculitis and perivasculitis, vasculitis and follicular atrophy secondary to killed rabies vaccine | | *Dogs, especially poodles, may develop lymphoplasmacytic panniculitis and perivasculitis, vasculitis and follicular atrophy secondary to killed rabies vaccine |
| + | |
| ===Intertrigo=== | | ===Intertrigo=== |
| *Also called '''skin fold dermatitis''' | | *Also called '''skin fold dermatitis''' |
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| *Cows with large, pendolous udder may become affected in area between thigh and udder | | *Cows with large, pendolous udder may become affected in area between thigh and udder |
| **In severe cases, skin and subcutis may slough | | **In severe cases, skin and subcutis may slough |
| + | |
| ===Pyotraumatic dermatitis=== | | ===Pyotraumatic dermatitis=== |
| *Also called '''acute moist dermatitis''' or ''''hot spot'''' | | *Also called '''acute moist dermatitis''' or ''''hot spot'''' |
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| **Ulceration | | **Ulceration |
| **In severe damage, squamous cell carcinoma may develop | | **In severe damage, squamous cell carcinoma may develop |
| + | |
| ===Low temperature damage=== | | ===Low temperature damage=== |
| *Prolonged cold can cause ice crystal formation and vascular injury resultic in damage to tissue due to increased intracellular salt concentration | | *Prolonged cold can cause ice crystal formation and vascular injury resultic in damage to tissue due to increased intracellular salt concentration |
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| *Areas affected are extremities | | *Areas affected are extremities |
| *Lesions consist of [[General Pathology - Necrosis#Gangrene|gangrene]] and necrotic tissue | | *Lesions consist of [[General Pathology - Necrosis#Gangrene|gangrene]] and necrotic tissue |
| + | |
| ===High temperature damage=== | | ===High temperature damage=== |
| *May result from excessive heat, liquids, flames, friction, lightning, electricity | | *May result from excessive heat, liquids, flames, friction, lightning, electricity |
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| *Melanogenesis | | *Melanogenesis |
| *Immune responses of skin are reduced by UV light | | *Immune responses of skin are reduced by UV light |
| + | |
| ===Solar dermatosis and neoplasia=== | | ===Solar dermatosis and neoplasia=== |
| *Caused by chronic sunlight damage | | *Caused by chronic sunlight damage |
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| *If damage repaired prior to mitosis - no lasting effect | | *If damage repaired prior to mitosis - no lasting effect |
| *If mitosis occurs before repair, post-mitotic repair is prone to faults and DNA mutations may result in neoplasia | | *If mitosis occurs before repair, post-mitotic repair is prone to faults and DNA mutations may result in neoplasia |
| + | |
| ===Solar dermatitis=== | | ===Solar dermatitis=== |
| *Particularly in white animals and where little or no hair is present | | *Particularly in white animals and where little or no hair is present |
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| **Dermal fibrosis | | **Dermal fibrosis |
| **Dogs may develop actinic [[Skin Glossary - Pathology|comedones]] | | **Dogs may develop actinic [[Skin Glossary - Pathology|comedones]] |
| + | |
| ===Photosensitisation=== | | ===Photosensitisation=== |
| *'''Primary''' | | *'''Primary''' |
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| **Ulceration | | **Ulceration |
| **Secondary infection | | **Secondary infection |
| + | |
| ===Photoenhanced dermatoses=== | | ===Photoenhanced dermatoses=== |
| *Many [[Skin Immunologic - Pathology|immune-mediated]] cutaneous disease are made worse by sunlight | | *Many [[Skin Immunologic - Pathology|immune-mediated]] cutaneous disease are made worse by sunlight |