Girls can experience itchiness when their breasts are developing mainly because there are many glands in the areola that secrete oil that cannot be cleaned in time, and this can cause itchiness over time due to the accumulation of dirt that irritates the local skin of the breasts.
In addition, if a girl wears a synthetic bra or tight clothing for a long period of time, this can lead to poor ventilation of the breast area or the normal drainage of sweat, which can also cause localised itchiness.