So a few weeks back my son developed these inflamed spots on his skin however only on his thighs (uploaded a pic) went to doctors the doctor wasn't concerned said maybe hives eventually the inflammation went away however now what's taken it's place are these dark marks on the parts where the spots are noticed a few days to a week now .... booked an appointment today waiting for doctor to contact tomorrow i'm quite worried about it attached how the dark marks look too bare in mind no where else on his body but his inner thighs on both leg