Random Blisters/Pimples

Hello everyone! My mother, who is 78 years old, recently discovered two blisters or pimples on her face that appeared suddenly three days ago. If these spots do not heal, we plan to consult our family doctor. I am curious to hear your opinions on what they might be. According to my mother, the spots are slightly itchy but not intolerable. I have been searching for possible causes online but haven't found any clear answers. I am feeling concerned and would appreciate any insights you might have.