I got my greek tortoise about a month ago from petsmart and they gave me a 14 day to bring back the pet thingy anyways first day i notice my little erikai had a bit of a scuff on her side i just thought maybe it was like a shell birth mark but over the past few weeks i think it has increased in size and i think it may be shell rot... if it is what measures do i have to take to help it? and if not then what signs should i look out for, for future reference?