Welcome to health care magic.
1.The way you have described the lesion it suggest as
breast abscess - infective lump with collection of pus within.
2.In this case what you need is get a
ultrasound scan done to evaluate the nature of the lump, its extensions weather its complicated or not.
3.In case of complication - a small
incision and drainage and cleaning the wound followed by a course of antibiotic will be helpful.
4.As a remedy never press, scratch or disturb the lesion - in that way you will delay the healing process.
5.Sugget you to see your GP, get examined, treated accordingly.
Good luck.
Hope i have answered your query,
any thing to ask ? do not hesitate to ask.
http://doctor.healthcaremagic.com/doctors/dr-ganesh/62888