We are still exploring all of these genetic factors and their links. There are still many unknown relationships between genes. I cited that sickle cell example to counter the previous person's agrument that things have to have a positive evolutionary purpose to be retained in our genetic makeup. This simply isn't true. Why do we still have schizophrenia and other serious (genetically determined) mental illnesses. Just what is their evolutionary benefit?
There is exisiting evidence to support the spainards spreading the cystic acne to american populations though. Its disucssed in Dr. James Fulton's book and in various journal articles.
There is also some evidence that diet and some topical products (things that are comedogenic) do worsen acne, but there is no medical evidence indicating that these factors are the root cause of acne. Unless you have some studies or journal articles that you aren't sharing with the rest of us?



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