What could be causing my areolas to shrink and change shape? (Photos)

Hi I'm 25 years old, I'm a virgin. I've always had large aeareoles but these past couple of days I have noticed that they are getting smaller, in particular on my left breast. Also the areolae's is no longer the circular shape, it's changed to a strange shape. I don't know if this is normal? Wondering if you could advise.