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9 times out of ten, severe itching and burning is the first symptom and the worst. Many doctors treat for yeast infection because they don't even know what Lichen Sclerosus is, so, many women and men go for years misdiagnosed. As the disease progresses the skin thins to the point of bruising and tearing. The architecture of the vulva can be drastically changed over time. Ie: inner labia disappearing, clitoral hood fusing.
Years can pass before symptoms get that bad, if treatment is kept up with you can hold off the worst of it.