Changes

==Diagnosis==

==Diagnosis==

A detailed history is important in order to aid in determining the underlying cause of the condition. A detailed description of the environment (bedding, quality of turnout, exposure to wet conditions) is particularly important. In order to rule out zoonotic infections such as [[Dermatophytosis]] or [[Cheyletiellosis|Cheyletiella]], the owner should be questioned to determine if other in-contact animals or humans have been affected.

A detailed history is important in order to aid in determining the underlying cause of the condition. A detailed description of the environment (bedding, quality of turnout, exposure to wet conditions) is particularly important. In order to rule out zoonotic infections such as [[Dermatophytosis]] or [[Cheyletiellosis|''Cheyletiella'']], the owner should be questioned to determine if other in-contact animals or humans have been affected.

The seasonal nature of the condition combined with a history of continual wetting may aid in diagnosis. However, the list of differential diagnoses for this condition is lengthy and several important conditions should be ruled out. If lesions are restricted to non-pigmented skin only, liver enzymes and bile acids should be evaluated in order to rule out [[Photosensitisation|photosensitisation]] as a cause of disease. Skin scrapes should be performed in order to rule out parasites such as [[Chorioptic Mange|Chorioptes mites]] (especially in heavily-feathered horses). Bacterial swabs for culture and skin biopsy may be useful in refractory cases.  

The seasonal nature of the condition combined with a history of continual wetting may aid in diagnosis. However, the list of differential diagnoses for this condition is lengthy and several important conditions should be ruled out. If lesions are restricted to non-pigmented skin only, liver enzymes and bile acids should be evaluated in order to rule out [[Photosensitisation|photosensitisation]] as a cause of disease. Skin scrapes should be performed in order to rule out parasites such as [[Chorioptic Mange|''Chorioptes'' mites]] (especially in heavily-feathered horses). Bacterial swabs for culture and skin biopsy may be useful in refractory cases.  

In chronic cases, diagnosis may be difficult and a diagnosis of idiopathic pastern dermatitis is often made.

In chronic cases, diagnosis may be difficult and a diagnosis of idiopathic pastern dermatitis is often made.