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Chronic inflammatory lesions tend to have melanin deposits as is shown here with the multifocal black skin pigmentation. This fish is healing from previous skin ulcers attributed to gyrodactylosis (skin flukes). Note that the epidermal proliferation around the head is normal for this breed (ranchu). It is called a ‘wen’ or ‘hood’. Sometimes the ‘wen’ can grow so much that it’ll grow over the eyes causing obstruction to sight and will need to be surgically trimmed.