Like "Hi there... Im not sure about the itching with sugar... but I do know for a fact that Metformin can cause rashes and severe itching.. even painful rashes and itching. That is why I was taken off of it. Within 3 weeks my rash was gone and I didn't itch anymore... well a little, but was due to winter dry skin... I, like u Use like massive amounts of lotion everyday, but still this winter wind here can make it itch. U may just have developed an intolerance to sugar since being diagnosed and put on meds?? not sure. Interesting to know what you find out tho. Have a great day. Nicki"