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Irritants such as '''faeces or urine''', and '''chemicals''' such as acids, alkali, detergents, irritant plants, medications and home furnishings can all cause the condition.  

Irritants such as '''faeces''' or '''urine''', and '''chemicals''' such as acids, alkali, detergents, irritant plants, medications and home furnishings can all cause the condition.  

In cats and dogs lesions usually occur on '''thinly-haired areas''' such as the skin of the ventral abdomen, feet, chest, eyelids and axillae.   

In cats and dogs lesions usually occur on '''thinly-haired areas''' such as the skin of the ventral abdomen, feet, chest, eyelids and axillae.   

== Clinical Signs ==

== Clinical Signs ==

The skin will appear erythematous with '''patches and papules and occasionally vesicles'''. Many lesions are also caused by self-trauma and include ulcers and crusts. Secondary bacterial infection can also occur.

The skin will appear erythematous with [[Skin Glossary - Pathology| patches and papules and occasionally vesicles]]. Many lesions are also caused by self-trauma and include ulcers and crusts. Secondary bacterial infection can also occur.

Lesions will appear in typical sites such as those described above and relating to the causes e.g. if the allergy is to the carpet then a dog will have the signs on his abdomen and scrotum.

Lesions will appear in typical sites such as those described above and relating to the causes e.g. if the allergy is to the carpet then a dog will have the signs on his abdomen and scrotum.