What could be the cause of Goldfish's wounds? (Pictures)

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Davala

Aquarium Advice Apprentice
Joined
Jul 31, 2014
Messages
17
Location
Wales
This goldfish has had many 'cuts' over the past month or two, where it looks as though it's flesh is protruding through the scales. I originally thought that there was something sharp in the tank, so I removed some ornaments, but this did not help. I own four young goldfish in a twenty gallon tank, and his is the only fish who is having difficulty, although swimming and eating as normal.

Hopefully in the pictures included you will see a sort of 'cotton wool' effect hanging out of the body.

What could be the cause? I have no water characteristic measuring ability, and please dont penalise me.:(

Link uploading doesn't seem to work, so here's the host files:
https://bl3302files.storage.live.co...TjjidVJq7sV1UwbEDk/WP_20141015_002.jpg?psid=1

https://bl3301files.storage.live.co...-Q5RxofLHJ1CJohx-g/WP_20141015_001.jpg?psid=1
 
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