Danio Looks Like It's Bleeding Please Help

[RossC]

Ok so a Danio in my tank is slowly looking worse, he developed what looked like a graze couple of weeks ago but its got worse and now it looks like hes grazed all over with blood-red patches. His scales have also started to stick up. He isn't bloated or gone skinny and he is still swimming ok but he is staying away from the other fish which isn't normal as the danios tend to be darting across the tank constantly. Here's some photos but the redness doesn't show up as clearly on pics:
Water params are perfect an no other fish are showing signs of illness

 

[sadguppy]

One of ny danios got caught behind the filter, how I have no clue, and looked exactly ike this. Sadly he died a few days later. Do you have a hospital tank you can move him to?

 

[RossC]

I moved him to a hospital tank that I set up and woke the next morning to find him dead. It must have been a parasite or disease I think

 

[purplesquid]

Could be a bacterial infection if it looks like he's bleeding under the skin. Treat it with some Erythromycin if it happens again. This happened to my Fire Molly a week ago and he is fine now.