I don't think he is carrying any extra fat in that area, as that is primarily muscles. I do believe that your horse had a reaction to the chemicals in the sheath cleaner. It is actually recommended that just warm water is used to clean the sheath. Using a chemical based product increases the chances of infections and washes away the good bacteria which can also open him up for infections, so, just use plain warm water to do this. I would give your Equine Vet a call, just incase there is an infection as the area is inflammed and you don't want this to turn into something extreme. The vet may start him on an antibiotic treatment. Here is a link to show you a natural way, using warm water, to clean the sheath for further reference:
http://www.justamere.com/newsletter/sheath.asp
Good luck with your boy and make sure he is getting proper feed and excersize to help him get to a healthy weight :)
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