But there's another common hormone disorder that can lead to underarm darkening. The disorder is diabetes, and the hormone is insulin, the chemical that helps to keep blood glucose in the normal range. In people with type 2 diabetes, cells become resistant to insulin over time.
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Typical costs: 1  The cost of fertility testing varies, based on the test. The least invasive testing can range from $50 to $200 or more for a sperm count and motility test; or for blood tests for the female to check the levels of hormones that promote the maturation and release of eggs.