DS, 18, has a recurrence of what appear to be stretch marks on his lower back. Several reddish and some far paler - the latter may be old marks that have faded.
Last time he got these marks, probably about 2 - 3 years ago, we got bio oil. Is this still the best thing to get? No sudden weight gain or loss this time. Last time (and this was confirmed by GP), we were probably looking at a growth spurt. Not this time. Any thoughts as to why a very probably fully grown, slim 18 year old could be getting these marks which, he says, feel a little sore at times. Thanks for any ideas and suggestions.