I really don't know, but from the look of the photo, I would be inclined to think they have mites.  I would treat them with a dose of Revolution and see if in a day or so, the wounds start to clear up.  If not, then I'd be looking for something that may be irritating them, I would less inclined to think this is a wound from fighting.  I would be interested to read other peoples thoughts.   I hope your girls recover from this soon. 

Mites are microscopic, so you can't see them on the poor guys. They just start itching, usually around their face, cheeks, and ears. Skin scrapes can come back with false negatives, so your best bet would be to go ahead and treat for mites. I personally like using Kitten Revolution from the vet since it's just one application and you don't have to go crazy with cleaning. Ivermectin is another option, but you have to scrub down everything, vacuum the floors, and toss everything that's paper/wood. I also had difficulty getting it into my girls.

Mites come into your home through wood and paper products like new toys, litter, etc.. You should freeze all new wood and paper products for 24-48hrs before putting them in the cage. You can also freeze their current stuff to kill any mites on them.

Generally, they'll give you the kitten/puppy type, and you put a drop (more or less...Revolution is very forgiving) on the back of their shoulders/neck, and then try to keep them distracted for 10-15 minutes, so they don't groom it all off, and that's it!  Easy as pie.

Thanks, well i have 8 rats to treat. I figure if one has it they all do or will get it so i'd rather be safe than sorry. I'm taking one rat to the vet and hoping they'll give me enough meds for all of them.

kitten/puppy and cat/small dog are I believe 60 mg/ml and dog is 120 mg/ml...twice as strong.

So, we went to the Vet. I really like this practice but he basically told me (after a skin scrape confirming mites, and ouch poor baby looks horrible from that) that he only does ivermectin injections and that problems arise from not diluting it well enough, and that he's worked extensively with rats and never has a problem. I felt uneasy but let him give her the injection. I have 2 other rats at hmes with mites, and i'm sure the other 5 have them as well, just no symptoms yet. So, they all need to be treated. EACH shot is 41 bucks (plus a 57 office fee for all of them conbined), and they'd all need 3 hts. That's 984 bucks. I have a vet reserve but not THAT much and my son is having surgery on friday. Keep in mind i'm not hugely comfortable with the injections anyways. So, I mentioned ivermection horse paste and he said he's heard of it, he can't tell me to go ahead with it, but he did tell me how to administer it. He will no prescribe or condone the use of revolution in rats...So I came home, cried, and ordered some revolution online. It won't arrive for a week. One of my girls has had her first ivermectin shot and in the meantime i don't want my others to suffer for a week. I thought about going and getting some ivermectin from the feed store, giving it to my other 7 rats, disinfecting/cleaning their cage, and then in 2-3 weeks dose them with one dose of revolution. What do you think. (I realize everyine will say go to vet, but i have done that already). What would you do? 

I have used ivermectin horse paste to treat lice on my girls in the past. You just have to be very careful on the dosage and have some yummy treats to give them afterwards (judging from their reaction, it doesnt taste good). It worked wonders......I've never used Revolution but I hear that's a good way to get situation under control.

When cleaning the cage, remember to get rid of any wooden or cardboard objects......You can't disinfect those 100% so its just safer to throw it away.

Thanks, all together 3 of my rats have scabs..fern was just the worst so she went to the vet. EACH shot is the 41 bucks...times 8 rats, and 3 doses it adds up. So, I went and bought the ivermection. I plan on treating the other 7 rats tonight, disinfecting the cage/washing fabric etc. then in 2 weeks (after the revolution gets here) I'll dose them with that and hopefully they'll be good to go after that. I know alot of people are against home medicating, but seriously, the vet wasnt much help and i refuse to subject them all to injections.

I don't know if it's my area or what (yorba linda/fullerton area) but all vets charge about $50 for the office visit $20-$20 for a skin scrape and the lowest i found on even the injections is like $35 for injection (I called around afterwards since it seems high). It's a good thing my hubby loves me and my rats. LOL 

I'm with Melina on this one. Home medicating with ivermectin or Revolution is pretty different from using Baytril, Doxy, etc.. Just make sure you mix the ivermectin really well before giving them the dose. It separates in the tube sometimes.

My vet told me one drop of the kitten/puppy Revolution on the back of their necks/shoulders.  It doesn't need to be exact, I guess, because it's not as dangerous as some if you overdo it.

Its usually like 0.03 - 0.1ish cc's depending on the size of your rats.  Its seriously just a tiny drop.  1cc would be enough to be a toxic overdose for most rats.