This may be sun related. First degree burns may present as blisters. If you have inadequately applied sunscreen on the face and on the areas surrounding the lips, then this may be a case of sunburn. If scaling and itchiness are present then a fungal infections may be a differential.
Apply cool compress on the area at least 3 times a day. Avoid hot beverages and spicy food. This should heal spontaneously as the injury does not sound extensive if this is a burn. If itching and scaling are present, have this assessed by your dermatologist as a perioral dermatitis or fungal infection may be present.
I would not advise any topical medications as inappropriate medications may only further irritate the skin.
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