Have 1/2 dollar size abscess on inner thigh. Red/Painful. On Augmentin (amoxicillin and clavulanate) X 1 week. No change. How long does it take to go away?

Needs to be lanced. I am sorry to tell you but antibiotics do not make an abscess go away. You need to see a doctor and have it opened an drained in order for it to resolve.