Hairless Rat Injury

Question
I have 2 female hairless rats (Peaches and Bella).  They are littermates and the best of friends.  They are still fairly young (about 7 months) and love to play.  Though I try to keep their claws trimmed, they still get little nicks and scratches from play fights.  Usually these heal up on their own with no problems.  

About a week ago I noticed that Peaches had a scratch between her shoulderblades, but nothing to worry about.  However, overnight a few days ago she suddenly had about a nickel-sized area that I can only describe as looking like "road rash".  It doesn't seem to bother her.  It will crust up, flake away, and then go right back to the same shiny, damp road rash look.  I've been told to try triple-antibiotic ointment.  She seems to enjoy the application of this ointment, but it's not really doing any good.  I do know that Bella grooms her, and I'm wondering if I should separate them, though I hate to do that.  I have talked to my vet, but he admits he doesn't have a lot of rat experience.  I will take her wherever needed, but I wanted to make sure that's really necessary first.  Is there anything I can do at home to help her?

Answer
I love Hairless rats....so warm and soft and their skin is so...buttery.
I love the curly whiskers, too! Just adorable!

I am trying to get a visual on this weird looking lesion. There is no lump under it at all? Its not spreading anywhere else? Does it hurt her or itch her?

When you put the antibiotic ointment on, do you rub in pretty good and keep her sister from grooming her for at least 10 minutes or so? It needs to absorb and it will, but if it gets licked off right away, it wont do anything.  However, it may not be bacterial...it could be fungal in nature.  

Lets try a few things before I suggest a vet, which I will find one for you anyhow for future use, all I need is your zip code.  

At the store, pick up some lotrimin cream or better yet, if you can find nizoral!  Apply this twice a day, rubbing in well but keeping sister from licking it for a bit. If you can find a place to Peaches so Bella cant lick her for at least say, 15 minutes, and after that, wipe it off of Peaches, that would be helpful too.  
So lets go for the anti-fungal for now but meanwhile, lets say that she may have some dry skin on top of that. Many nekkid rat owners say that they rub their rats entire body with olive oil, and its totally OK if they lick it off, its good for them to be honest. It keeps their skin soft and anointed on top of that and helps with dry skin which they can be prone to getting.  The only reason I say this is because if your Peaches had any type of fungus or bacterial infection going on, it would make sense that Bella would get it as well, unless it is host specific, which it may very well could be.  
About the olive oil...you can also saturate a piece of a cracker with the olive oil and let the rat eat that too, a few times a week. This is done for furred rats with dry skin since rubbing a furry rat with olive oil could prove very messy indeed!  LOL

Next, let me know your zip code and I will find some vets that care for rats for you for the future if your rats do need one instead of being all upset trying frantically to find one which may be difficult if the time comes you need one.  Its better to be ready!