Why is my chest so itchy all of a sudden?

K C Asked: Why is my chest so itchy all of a sudden?

Well im 14 and ive had a bra size of a 32a for almost over 2 years now and my chest is really itchy! i have some acne on my chest though but thats never been itchy before. whats going on? are my breasts growing again or no…also another question is when you get a growth spurt for breast size about how much do they grow durring that time? Thanks !