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).
Sore Armpit. Causes of a Sore Armpit. A swollen or sore armpit can be a painful and frightening condition. The entire armpit may feel sore, or you may have soreness in just one spot. Many people will feel these painful, hard lumps under the arm and be afraid that it is a cancerous growth.f you do not have swollen lymph nodes, a swollen or sore armpit may be caused by an infection in the layers of skin, sometimes called cellulitis. People get these infections frequently under their arms from nicks caused by shaving.