Breakthrough: A stye is a pus filled gland of the lid. If untreated, it will enlarge and eventually breaks through to the surface. If the area is not cleaned - and they are commonly tender at this stage - the material passing through to the outside can oxidize and turn dark to black. This should be cleaned with warm soaks and this may help clear it up. Otherwise see your ophthalmologist.
Answered 9/23/2019
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