Spot of bearded dragons belly (not a stress mark)

[TurtugaTom]

my bearded dragon has had this spot for a while i think it could be shed but I'm not sure if the stress marks are bad but he has always had them some sources say really stressed lizards will keep them forever i don't think he is stressed lately but he has had multiple owners and went throw a traumatic experience mentioned in another forum

 

[SPandS]

Looks like shed to me

 

[TurtugaTom]

Looks like shed to me

Yea I thought so to but its been there for a while and I wasn't sure if they shed on there belly and he has a sand mat and often climbs on his log so I assumed if it was shed it would be gone by now if it is shed is there anything I can do to help him I know your not supposed to touch it but can I soak him and maybe pet his belly to help it