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The pigment products which are deposited in the skin cause secondary [[Photosensitisation|'''photosensitisation''']].  This manifests as a crusting dermatitis in non-pigmented areas of the skin which are exposed to sunlight. Cattle are often affected over their face, around their eyes and over any white patches of the body.
 
The pigment products which are deposited in the skin cause secondary [[Photosensitisation|'''photosensitisation''']].  This manifests as a crusting dermatitis in non-pigmented areas of the skin which are exposed to sunlight. Cattle are often affected over their face, around their eyes and over any white patches of the body.
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Some types of porphyria may cause [[Anaemia - Introduction|'''anaemia''']] in Siamese cats.
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Some types of porphyria may cause [[Regenerative and Non-Regenerative Anaemias|anaemia]] in Siamese cats.
    
===Differential Diagnoses===
 
===Differential Diagnoses===
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