My daughter 12 yrs old suffering w/ severe acne,started isotretinoin many solutions, just started isotretinoin 20mg on 7 days after 5 shes complaing w/ back pain right up spine up middle of back, worse when she moves, active doesnt bother her when sleeping,resting laying,etc. on 6 day its little worse,its on weekend so i will contact dr. on monday morning. anyone else had this problem? everything else just fine why this? help...