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my res flash whos about 5 inchs has a spot on his neck that looks like his shell is rubbing. was wondering what i should do to keep it from getting worse?

Is it on the top spot? This might happen if the nuchal scute doesn't shed and becomes too long. Does it look noticeably long?

a little. i will have to get a pic posted for you to see tomorrow. if it is what would be the best course to take? not much back story on flash. went to petco to get a new heater for my map turtle and he was the only one swimming around. the water was nasty and he looked sick is the best way to put it. i got him to see if i could help him and that was about a year ago. now he great outher than the spot on his neck that just came up within the last couple of days. well sence saturday. thats when i did a filter clean and got him out in the yard for a bit.

If it is a sharp nuchal scute, a vet can debride it. Does he have a habit of looking upwards, to the point that the top of his neck rubs against it?