In this case, Kim’s mother’s burn formed blisters. These blisters are often closed and fluid filled. Recall that a first-degree burn is characterized by redness, not blisters. Why do you think a first-degree burn does not blister?

A first degree burn affects the superficial layer of the skin.

Explanation:

A first-degree burn such as a sunburn, is a burn that affects the outermost layer of the skin. It's referred to as a superficial burn. The effects of first degree burns are generally mild, however few cases could be worse than the normal redness and non-blistered wound seen in most patients. These type of burns can be treated with home remedies and mostly do not require medical treatment.