Hi, A hard, movable bump in between the breasts could have various potential causes. One possibility is a cyst, which is a fluid-filled sac that can develop just beneath the skin. Cysts are usually not harmful but can become painful if they become infected or inflamed. Another possibility is a sebaceous cyst, which is a noncancerous growth that can develop in a hair follicle. These cysts can become infected or inflamed, causing pain and discomfort. It is also possible that the bump is a swollen lymph node, which can occur when the immune system is fighting an infection or illness. Lymph nodes are small, bean-shaped structures that filter lymphatic fluid and contain immune cells. Given the symptoms you have described, it is possible that the bump was a cyst that became infected and developed a whitehead. Squeezing the bump and peeling the skin could cause further irritation and infection, leading to oozing and pain. It is important to keep the area clean and apply an antibacterial ointment, such as Neosporin, to prevent further infection. If the bump does not improve or becomes more painful, it is recommended to seek medical attention from a healthcare provider who can evaluate the bump and recommend the appropriate treatment. Take care. Hope I have answered your question. Let me know if I can assist you further. Regards, Dr. Priyanka, General & Family Physician