Should I separate?

[SabreRose]

So my girls are about 18 months (I’ve had them since they were 5 months) and never had a problem.
Yesterday I noticed bite marks on Willow’s back. One is quite bad looking. They’ve never had an biting incidents before but I know they say once blood is drawn to separate.
Though i have just moved them in for the winter the other day and Ruby (the biter) seemed really agitated after the move. Oils that have made her lash out and bite? And if so, should I leave them (obviously monitored) and see if it was a once off? Or separate them?
I don’t want either of them hurt again but at the same time, separating them is so permanent.
Any advice would be greatly appreciated.
Thanks

 

[SabreRose]

Sorry I should also add, they’re in a 140 by 70cm cage and have two of everything.

 

[Wiebke]

So my girls are about 18 months (I’ve had them since they were 5 months) and never had a problem.
Yesterday I noticed bite marks on Willow’s back. One is quite bad looking. They’ve never had an biting incidents before but I know they say once blood is drawn to separate.
Though i have just moved them in for the winter the other day and Ruby (the biter) seemed really agitated after the move. Oils that have made her lash out and bite? And if so, should I leave them (obviously monitored) and see if it was a once off? Or separate them?
I don’t want either of them hurt again but at the same time, separating them is so permanent.
Any advice would be greatly appreciated.
Thanks

Please have Willow vet checked for mange mites first and foremost; sows usually do not get into fights with deep bites. These wounds are generally self-inflicted because of pain/discomfort in the skin. We can only tell you what avenues to pursue; we cannot and are not qualified to replace a hands-on vet examination.
Mange mites can come up rather quickly if the immune system is lowered through some major stress and/or an underlying health problem. Any eggs in the skin are usually kept in check by a fully operational immune system.
What to check and look out for in new guinea pigs (vet checks, sexing, parasites&illness)

Piggies have to re-establish their hierarchy in any new surroundings. Here are tips for finding out whether the bond is in trouble and what your options are if that is really the case: Bonds In Trouble

 

[VickiA]

that you would do well to get her seen by the vet to check what's going on. I'd be suspicious of mites causing the problem and her gnawing at the skin. However, if it has been caused by her cage mate then I'd be looking for signs of trouble between them as Wiebke has said.