Lugols is good for scars, put pimples.. I dont know; my teenager son never found Lugols any good here, topically.
For the vit C / lugols; as I said; just a tiny pinch of vit C (ascorbic acid), enough to make the solution clear / colorless.
You may have a little water in it if it is too strong. Like half water / half lugols, then the pinch of vit C.
Dont store, this solution is to be used right away.