Be careful with Neosporin, it can actually be harder on snakes but works well for lizards. Also make sure it's the type without pain killers as the pain killer can be toxic.
There's definitely some sore of damage there and I can't tell you why. His belly looks like nice and white, are there red open sores or streaks near the back problem? My concern would be a possible systemic infection that will need antibiotics.
I would consider giving him a comfortable warm bath. Consider using some betadine or chlorhexidine. I like to soak them in the warm water for a bit before soaking them in the diluted medicine to make sure they don't drink it.
Silver sulfa can sometimes be found otc and works great on wounds for snakes instead of Neosporin. Neosporin has oil that can damage the scales.
If he is a rescue and has issues with parasites and wobble I would consider a thorough vet check to make sure you aren't accidentally giving any medications that can stress him out or make him feel worse. He can be dehydrated and anemic from mites or sometimes mites can also spread disease
As far as size... He actually doesn't look too bad. Males do tend to stay smaller and he doesn't see too underweight? Just a gross living environment... With bugs and either dirty bedding, hazardous furniture or a burn to explain the back injury.
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