My 11 month old son has contracted a hand-foot-and-mouth disease for the second time in one month, but this time the rash/blisters are only on the insides of his hands, and the it his quite severe, hes rubbing his hands raw! Can I use calamine lotion on them to help the itch?
Calamine lotion may be soothing. Talk to his pediatrician about something oral to help with the itching, such as Ben Chat Doctor.  You may have to put the lotion on with mittens on so he doesn't keep rubbing his hands raw. There is also the risk of a secondary infection with bacteria if he continues doing that. Your pediatrician may also have other suggestions, such as a topical medicine that may numb up the rash a bit, so talk to him or her. Hope this helps.