Suggest Treatment For Down Syndrome That Develops Increasing Shoulder Stretch Marks And Recurring Small Blisters On His Back

Dear Doctor, I have 17yrs down syndrome child. there are stretch marks appeared on his shoulders (both sides) It appeared a year ago. Now that stretch marks have increased. Small blisters appear frequently on his back also. They don t explode. But it remains like small knots. Can you please give any treatments to my child. Thank you, Mother of child