Armpit Pain Causes

The muscle weakness that patients exhibit is caused by damage to the nerves that lead to that particular area.
http://jtrader.hubpages.com/hub/Left-Arm-Sore-with-Epstein-Barr-Causes-and-Treatment-of-Armpit-Pain

Glycolic Acid Benefits

Glycolic acid is one of the alpha-hydroxy acids or AHAs. The alpha-hydroxy acids also include citric, lactic and tartaric acid. All of these acids remove dead and damaged cells.
http://jtrader.hubpages.com/hub/Benefits-of-Glycolic-Acid-vs-Hyaluronic-Acid-for-Skin-Care