Dhawan was hit on his left thumb by a delivery from Nathan Coulter-Nile and needed medical attention.
Physiotherapist Patrick Farhart would check on him during breaks as he continued manfully, getting to 117 off 109 balls.
With his finger taped, as a precautionary measure, he didn't take field during the Australian innings.
It was Ravindra Jadeja who took field instead.
Dhawan's good run in ICC tournaments continued as his stylish hundred formed the cornerstone of a fantastic batting display that powered India to a commanding 352 for five against Aaron Finch's side.