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==Clinical signs==
 
==Clinical signs==
[[Image:Cow-_photosensitivity.jpg‎|right|thumb|125px|<small><center>Photosensitisation in a Friesian cow (Image sourced from Wikimedia Commons))</center></small>]]
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[[Image:Cow-_photosensitivity.jpg‎|right|thumb|200px|<small><center>Photosensitisation in a Friesian cow (Image sourced from Wikimedia Commons))</center></small>]]
 
The condition is characterised by clearly demarcated 'sunburn-like' lesions that are confined to unpigmented or hairless areas of the skin. The nose, lips, ears, muzzle and udder are commonly affected areas. In the acute stages, the affected area(s) becomes erythematous and oedematous with exudation and crust formation. Animals may be pruritic or painful. Other clinical signs may include swollen lips or muzzle, tachypnoea, tachycardia, diarrhoea and salivation.
 
The condition is characterised by clearly demarcated 'sunburn-like' lesions that are confined to unpigmented or hairless areas of the skin. The nose, lips, ears, muzzle and udder are commonly affected areas. In the acute stages, the affected area(s) becomes erythematous and oedematous with exudation and crust formation. Animals may be pruritic or painful. Other clinical signs may include swollen lips or muzzle, tachypnoea, tachycardia, diarrhoea and salivation.
  
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