With a scalpel, the pure green stuff - malachite - will sometimes lift off an antonininus like this leaving the
silvering whole underneath.
BUT, yours does not appear to have that kind of nice pure green stuff - it looks thick and bubbly with dark
red spots mixed in. That looks like a totally different
type of corrosion that has eaten into the coin. Under these
red and green blisters is likely just a deeply
pitted surface.
Sadly, if I am right there is little that can be done.....
SC