Hello, I have gone through your query and understand your concern. No. This is not due to Claravis ( isotretinoin). These testicular movement is due to Retractile testis. In this there is a movement of testis to groin from scrotum and vice-verse. This is due to action of the muscle called Cremaster muscle in scrotum surrounding testis. The contraction of the muscle causes the testis to pull up to groin. You may have short Spermatic cord or failure of disintegration of some structure attaching abdomen and testis. First you have to watch, how frequently it moves and what are all the factor which cause the movement of scrotum up. Note down and consult a surgeon. As you are above 14, My recommendation is for surgery and fixation of testis in scrotum. This can be corrected by surgery - Orchiopexy- in this testis is fixed into the scrotum and regular annual follow up. Hope this helps. Please write back for further queries. Wishing you good health.