my guinea pigs are fighting alot

Question
i have 2 male guinea pigs that are about 3 years old. first i'll start off with critter.
over time, he has been losing weight and now he is very skinny and delicate, but he eats normally. i do not know what might be wrong  with him.
now,the other one, cinnamon has been sneezing alot, and making strange noises i've never heard before. he is also very shaky, but we keep the room at a normal temperature and we cover their glass house with two towels in the winter to keep them warm.he has two tumors on his rump, they've been there for a while but my mom says not to worry, and she has never taken him to a vet. also, on his rump, his fur is stiff and comes off in clumps, he is also very sensitive in that area when we bathe him. i cannot find out what it is exactly.
also, recently, the two have been fighting constantly. critter bites cinnamon, then cinnamon bites back and they start clawing each other, and they squeak when they're done fighting. often, critter mounts cinnamon, then cinnamon runs away, critter then follows him quickly, and sinks his teeth into the sensitive area on cinnamon's rump, while cinnamon drags himself into his little igloo. i hate seeing them like this, i started noticing it about 3 days ago, they have been rough with each other all their lives but never this much.  

Answer
Hello Rachel,

First and foremost, they need to be separated. They are hurting each other. When the fighting includes hurting each other, they need separate homes for their own safety. The may very well kill each other eventually if they aren't separated. Secondly, they both need to see a vet. Cinnamon may very well have tumors that can be removed and no longer cause any problems. He may also have abscesses. Abscesses are extremely painful infections and require a vets care. Abscesses can kill if left untreated. Treatment for abscesses is draining, antibiotics, and/or surgical removal. He may also have an early URI. Treatment is antibiotics. If he does have a URI, without treatment, he'll die. Critter may be diabetic. A common symptom of diabetes is losing weight inspite of eating normally. Worms are another possiblity. Diabetes can be treated with insulin and/or diet changes and worms can be taken care of with a dewormer. They both really need to see a vet. Unfortunantly there's not alot you can do for their physical problems without a vet's treatment. None of the possible causes of their problems has a home treatment. You should however, get them separate cages as soon as possible.

-kkat
http://www.geocities.com/abyssinianguineapigs