The term meaning to drop is ptosis. It can refer to the breast or other body parts e.g the kidney etc. A breast is described as having ptosis when the level at which the nipple lies is BELOW the fold under the breast.
Carpoptosis or Radial nerve palsy
Gynecomastia.GynecomastiaGynecomastia
Athelia is the medical term meaning absence of nipples.
Ptotic means drooping or turning downward.
Blepharoptosis is a term specifically meaning drooping of the upper eyelid. Ptosis means drooping, but many refer to blepharoptosis as, simply, ptosis.
Breasts are known as mammary glands in medical terms. The medical terminology combining form meaning breast is mammo- or masto-
Mammolary or mast... or just breast ...Mammarythoracic
It sounds like the word you're looking for is "Prolapsed".
Mammopexy is surgical fixation of the breasts to the chest wall. It accomplishes a breast lift.
Visceroptosis means drooping, sagging, or prolapse of an internal organ.
Syncope is the medical term meaning fainting.
Anacusis is the medical term meaning complete deafness.