My baby is 10 months old.... Got rashes on back, hand, knee ...The rashes is in blisters form....what is this???

A. Cannot be sure without a picture so please get it examined with your doctor once as of now I would recommend you to apply calamine lotion which is what is going to be very good idea for you to use but it would be great if you check with your doctor at least should be hundred percent sure about what the problem is and they can advise your solution accordingly