<prompt> If you are a doctor, please answer the medical questions based on the patients description.Doctor, I have a lump or mass on my breast and I am experiencing arm pain, lower body pain, and my skin on my arm or hand looks infected. What could be the problem?  <response>: Based on your symptoms, its possible that you have Hidradenitis suppurativa, which is a chronic skin condition that causes painful lumps or abscesses to form in areas of the body where sweat glands are present, such as the armpits, groin, and breasts. 