How to Handle Red Blister Rashes on a 5-Month-Old Baby?

A 5-month-old baby has developed several red blisters on the forehead and back of the hands, resembling adult blisters, with similar occurrences on the back of the hand and lower lip. These blisters are red and hard, and a small amount of liquid is released after they break. How can you determine the nature of these blisters and how should they be treated?
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