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[–] opinionatedduck ago 

It looks like it'll swallow anything that is too close to its maw.

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[–] Hamroast 0 points 1 point (+1|-0) ago  (edited ago)

Looks like tube rash.

Happens when the skin on your upper arms rubs against the rubber of an inner tube while paddling on the water.

Eye bleach example: http://media.gettyimages.com/photos/woman-floating-in-inner-tube-in-river-picture-id184313113