how do i get rid of rings in leather?

[redror]

i had a dehumidifier resting on my passenger seat and when i took it out there were 4 rings left in the leather from the base of it (very stupid i know) and its annoying me, does anyone know a way to remove them by heating it/cooling it/ stretching it etc. maybe getting a fat lass to sit in there for a while??
cheers

[kam-325i]

might be better of asking in the detailing section.