First of all, I would never house two males together unless they were both hatchlings and then only temporarily (like until the next payday when I went and got another enclosure) Second, reptibark is great for box turtles and lousy for ball pythons. I have seen countless RI's (respiratory infections) develop due to irritation from the amount of dust that stuff puts off. Lastly, if your snake got a burn you are going to want to soak it daily for at least 30 mins. in barely warm water in a secure tub/tote. Put about 1/2 to 1 inch of water depending on the size of the snake. Paper towels is great and use a ceramic emitter or red light (either about 60 watts) to heat the enclosure making sure of course that the snake can't come in contact with either heat source. I wouldn't eat if I were in pain or stressed by a roomie either. 

In a few sheds you should see improvement on the belly. If at any time it swells, starts to seep/bleed/pus go to the vet immediately, its infected. Do not put anything on your snake unless you can get silvadene (silver sulfadene) ointment. Then apply it after each soak.

Yea, definitely a no no on putting the boys together, especially with no quarantine period. Quarantine your new snakes ALWAYS. It isn't worth it to risk your other snakes! 

That being said, keeping him on newspaper or paper towels would be your best bet right now.

+1 to both. NEVER house bps together especially without quarentine. With the possible burn (you should be regulating any UTH with a thermostat for any and all of your snakes....) keeping him on newpaper is best, change it out if it gets soiled or wet. You can use regular neosporin (the regular NOT the one with painkiller) on the burn 2-3 times a day until his next shed. IF the burn is better after he sheds you should be all set, if it does not get any better or appears worse a vet trip will be needed.

@Leah, do NOT put a petroleum based ointment on a burn! This is why I suggested sulfadene. 

ok thanks guys they are all seperated now and will deff quarantime all my animals from now on and keep them on newspaper or paper towels. all the other animals ive bread i have had since babys my corns /rats/kings and burmese.

Shell, for minor burns (which is what it sounds like), Neosporin works fine? I've never burned my snake before personally but anytime I've ever heard about minor burns it's always Neosporin twice a day until the next shed. If it's the same or worse then vet trip...must say you're the first person so say no to that?

Okay I really want to start over. Are you SURE this is a burn? I know you asked the question as if it was, but without a picture I think it makes it very difficult for us to help you. IF this is a mild burn, here is the treatment directly from Rossi's book "What's Wrong With My Snake?"

..."The second step [first find and resolve the cause of the burn] is to apply topical antibiotic ointment (such as polysporin, Silvadene cream 1%, or betadine) to the lesions once daily for a period of three to four weeks. In many cases, it is advisable to allow the snake to soak in a povidone-iodine solution for thirty minutes per day prior to applying the ointment."...

Ref. Dr J. Rossi, DMV, MA and R. Rossi "What's Wrong with My Snake" 2006 AVS pub.

If you are not SURE this is a mild burn, don't attempt to treat it on your own. A vet will be needed.

I was wondering if someone would ask if it REALLY was a burn.... It is very unlikely that a snake would get a burn from a UTH on the outside of the tank... I have never seen one that gets hot enough to do that (even without a thermostat) unless it is malfunctioning.

Sylvias, like you I have never seen it either, however a while ago I had a cheesy Zoomed small UTH under a tank and my temp gun was reading very much over 130* on the bottom of the tank. I'd think maybe prolonged periods laying on that could cause a burn that the OP is describing. Honestly without a picture we can can never know, I just had to do some research on mild burns specifically because the petroleum thing was bothering me. I was also told for more severe burns DO NOT use Neosporin because it seals in heat and can make it more painful. But as far as this, I am now curious if it really is a minor burn...pictures would do wonders.

I have been gone for the weekend...I have seen burns from undertanks heaters, they can heat glass and they can malfunction especially the ultratherm type. A burn can be aggravated by ointments with petroleum base because it holds the heat in. Sort of like the old butter on a burn myth. I have heard this from more than one vet and several people doctors will tell you the same thing for people. Silvadene was made for burns. 

With out a picture it is difficylt to say what the problem really is but either way the animal needs some care and soaking and sulfadene are not harmful and neither are paper bedding and alternate heat sources.  It goes with out saying that if the snake needs more help than that he needs a vet.

Did anyone even see the belly mark in question?

the danger of any oily petroleum based  repeatedly applied is in how it can complicate ecdysis in that area . If the snake goes pre-shed , in the period after just before the shed when the new layer is still forming or is in the phase of cellular seperation - it ruptures and is cast off prematurely - it causes bad scarring , or worse - sloughing of the whole exuv prematurely resulting in death . Its uncommon but possible in an unfortunate sequence of events

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