I have generalized itching on 12th day of augmentin (amoxicillin and clavulanate) plan for 20days due to submandibular abscess.no rash or other s/s, should i stop augmentin (amoxicillin and clavulanate)?

Yes: Itching is a red flag for an allergic response. Call your dr. And explain your symptoms. An alternative med will be prescribed !

Probably: I would mention this to the prescribing physician, who should hopefully suggest an alternative for you.

Yes: Skin reaction (such as itching) is one of the true signs of an allergy. Discontinuing the antibiotic is suggested on an immediate basis. Inform the prescribing doctor asap. Has the source of the abscess been determined and treated? The prescribed course of antibiotics seems very long in this case.