My telescope goldfish has had problems since I got her in March, she has had dropsy off and on and floated sometimes. I have had to take her out of her tank and put her in a small dish of shallow water with epsom salt and melafix and change the water every day to keep her upright, then put her back in her tank when she was ok. She was doing all right the other day and I had her back in her tank but now this morning she has these red marks on her. Yesterday she had a small red mark on her that I thought looked like a small bruise on her belly or a place that she could have gotten bumped. Today it looks worse and bigger like an ulcer maybe? But i'm not sure. And now she has a red blood mark in her tail. It does not look the same as streaks from ammonia. I just changed the water and there is no ammonia and the tank is cycled. Its deeper and darker than streaks from ammonia and more patchy than that. The ph is 8.2 I think and the ammonia 0 and nitrites 0. Not sure what to do or what the patches are. Does any one have any idea or any suggestions? She is my favorite fish, I am not sure if I should just euthenize her being that she's had a rough life and I don't want her to suffer. If I can help her a will I'm just not sure what to do for this.

the only thing i can think of is bacterial infection.

Yes, that's what it sounds like to me. When I started my tank I brought home a fish with a bacterial infection and it started just like you are describing. There are fish antibiotics at the pet store but to be completely honest I didn't have any luck. But maybe I started too late . . . can someone with more experience help out here? Medigold, maracyn? For now, my best advice is to check for nitrates and do a water change if need be. Hopefully someone can be more helpful about the meds than I can . . .