Bam Bam and Pebbels have battle wounds!
I have seen this many times before - even with a few of our own.
Veiled must be separated by 3 months of age - they compete for everything (food, walking area, basking area, water drops, sleeping perch). At this age, they should have a cage that is 18x18x30 or larger. These guys can be ever so active!!
The foot/leg on Pebbles has cuts - it needs to be treated with antibiotic ointment (we prefer SSD - silver sulfadiazine cream) immediately. There are several good ones - the best are only available from your vet. The dk places on her tail doesn't look too bad (from the photo), but we would use the ointment there too. If you don't get the infection under control, she may need amputation or may possibly die.
The mark behind Bam Bam's eye is either a scratch or bite. It doesn't really look severe enough to need medication - and the area is a sensitive one, so the ointment approach would be tricky. The dark mark should fade with future sheds. Chams bruise in this manner.
It sounds like you need to get the cage cleaned out too. While your chams are out of the cage, clean everything down with diluted bleach (1/2-1/2 water), then rinse and let dry. To speed drying, you can use a hairdryer. If you have plants, use antibacterial soap (1 tsp per qt water in sprayer) and wash them down too - rinse, rinse, rinse - then let dry.
If you need other husbandry help - just ask, that is what this forum is for. You may get differing advise, but it is all aimed at helping you provide a better environment for your chams. 
Don't forget - call your vet... 
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