<s>[INST] I have a very large growth in between my breasts. It began as a large pimple but within 2 days it grew to the shape and size of an almond. now it has moved down into the middle and it very painful with some fluid bumps in it and it has a red ring. what could this be? [/INST] Hi. Thanks for your query. This appears from your history to be an infected sebaceous cyst, as the lump was smaller like a large pimple you say, and has grown in size of an almond, is painful, has liquid bumps and has a red ring. Do not worry, consult a Doctor, preferably a Surgeon, get an antibiotic and anti-inflammatory medicine cover. This may resolve. IF not you may need a procedure called marsupilization to remove the inner lining. </s>