certainly the gynecologist did a clinical examination on you and his treatment was certainly based on clinical grounds. With a small abscess
of the Barholin gland, appropriate and well chosen anti biotherapy can be enough to take care of the situation. Itching is a normal reaction simply due to inflammatory effects of some chemicals involved in the process of healing, which should normally decrease with time.
However, if you notice an increase in pain, enlargement of the abscess, onset of fever
or general malaise
, its shall be reasonable to inform your gynecologist. If not, I think you should not be bothered at this stage and simply followed your drugs as prescribed.
Hope this helps,