no, they won't.

Massaging your breasts will not create a lump in them. They will also not shrink them. Will they make them grow? Possibly, but it's not guaranteed. Bad circulation might hamper optimal growth, so increasing circulation with massage could cause a slight improvement in growth and fullness if there was already a prior interference with it and massage happened to fix it. It's really not something guaranteed. I would think other aspects of lifestyle such as diet might play a larger part. Hormones as well.

Massage certainly helps to increase breast size. An effective method is to (first warm your hands) place your hand over the breast with the nipple resting in the centre of the palm. Holding the breast gently but firmly commence a clockwise rotation of the breast for nine rotations; then reverse the movement massaging the breast anti-clockwise for a further nine rotations. Perform this action on both breasts daily. I recommend to clients they do this while showering or have a partner do it for them. When rotating the breast the method is to gently pull the breast down, then across, upwards, and across in a six o'clock, nine o'clock, twelve o'clock and three o'clock rotational manner.

For nipple enlargement and prominence roll the nipple gently between the thumb and first two fingers for ten seconds then draw and pull the nipple outwards. Perform nine times.

I am a biological malke ,but I would like to let all the true biological females out there that are wondering if massage will promote breast growth . Well I can tell you from my experience that it does in fact make your breasts grow .There are many ways to do it ,but the one that works for me starts with you rubbing your hands together to get them warm.Then you proceed to massage your breasts.Left hand going counter clockwise ,and right hand going clock wise. Do not massage the nipples doing this.I don't know the reason behind it but that is what I have been told.You have to keep rubbing your hands frequently to keep them warm for deep penetration.Do this for 15 minutes when you get up ,and 15 minutes before you go to bed. In a month of doing this ,you will see the results!

massaging does work,i was ina girls hostel, and it worked for all the girls that did it, they r ur breasts do what u want with them, but not to hard cause it could create a lump, ppl that dont believe it work, tried and expected immediate affect, u didnt grow in a day u kno, although, if that little lump that was there when it started growin has gone, that makes it much hrder!

how do u get rid of stretch marks on your breasts?

if you masturbate you can get a stimulation and your breast become looser,
then you might start massaging.

ok first of all,
bigger boobs are every girls dreams, this is what had helped me.
take a lotion that you think makes your skin SLIPPPERY
now cup your hand around your boobs and massage realy slow and move your body up and down while your doing this,
have you or your partner suck the tip of your nipple realy softly, becuase this gets your blood
rushing to the top of your nipple,
while you are getting this feeling of masagging then you and your partner need to get hot,
masturbate or us a vibrator, somthing, so you might get sweat,
put warm water on your breat and let you partner rub and rub,
this is how you can make your breast grow,
me and my husband did this once a week for a month and i went from a
42a to a 54b:):):)
im realy happy , you should try this.

anything that helps with circulation will help any problem so why not this. they wont get huge obviously, but it will stimulate them. try doing exercises that build the muscle underneath but not every day.

http://www.videojug.com/film/how-to-make-your-breasts-look-bigger

or you could just go that route.