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==Clinical signs==
==Clinical signs==
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.
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.
If the photosensitisation is secondary (hepatogenous), icterus may be present. Other signs may include those consistent with hepatic encephalopathy such as head-pressing, circling, and behavioural changes.
==Diagnosis==
==Diagnosis==