Certain conditions may trigger additional production of blood cells. When the oxygen content of body tissues is low or the number of red blood cells decreases, the kidneys produce and release erythropoietin, a hormone that stimulates the bone marrow to produce more red blood cells.The bone marrow produces and releases more white blood cells in response to infections.ertain conditions may trigger additional production of blood cells. When the oxygen content of body tissues is low or the number of red blood cells decreases, the kidneys produce and release erythropoietin, a hormone that stimulates the bone marrow to produce more red blood cells.
A Painful Armpit Lump may be Caused by Shaving or Deodorant. Although a painful armpit lump may have many causes there may be a very simple explanation for your condition. âCysts and infections on the surface of the skin of the armpit may be caused by shaving or use of antiperspirants (as opposed to deodorants).
4. Antiperspirants. Regular use of antiperspirants can sometimes cause lumps under your armpits. This usually happens when you're allergic to or your body reacts to one of the chemicals used in your brand of antiperspirant. Treatment: The simple treatment is to change the brand and see how well the other works. If you get another pea-sized lump in armpit, you should stop using any type of antiperspirant at all.