If that is a burn, it's very minor and you caught it in time. If a snake gets burned and the scales behind to rise away from the body, discolor, or become blister like, then it needs to go to the vet for silver burn cream and possibly antibiotics. If none of this happens then you will be ok.
Keep in mind that for about the first year, you can see the line on the snakes belly where the umbilical cord was and going farther down it's belly. Kind of like a seam. This is normal and will become more pronounced before they are going to shed. The belly will begin to turn pink before the eyes cloud or the body gets dull.