Gabriela, first of all, it's NOT OK to be punched on the breast - by your little brother, or your friends. Both may think it's funny - but first of all, it hurts, as you well know; and second, your breasts are easily injured, and need to be protected. Next time it happens, don't go along with it and laugh; get REALLY MAD and yell. Throw a scare into them; that might get them to stop.
Yes, your breast is probably bruised. And since you're at the age when your breasts are developing (please read our guide to breast development for more on that), the punch may vry well have hit a breast bud, which is tissue that's developing quickly, and can be sore anyway - let alone when someone punches it. Try putting an ice pack on it; hopefully the pain will abate in a few days. If not - or if your breast changesin appearance (red, hot, swollen), then it would be best to see a doctor, to find out what's happened.
Again, PLEASE try to avoid the punching; you could be doing permanent damage. Scar tissue can develop, and not only affect your ability to nurse a baby, but can make it difficult for doctors to read your mammogram in the future. You don't want lots of extra mammograms and possibly a biopsy when you're, say, 25, because of years-old scar tissue, do you? Not fun. So enough with the violence, OK? Take care. PJH
Gabriela, PJ is absolutely right. You can not allow anyone to hit you on the breasts or anywhere else hard enough to give you bruises and pain. You need to think about why this is happening. If your brother and friends are mean and really trying to hurt you, then you need help for a parent, teacher, or other adult to stop the violence. If this is happening when you all are roughousing and wrestling in playful ways, then you need to stop your part in the playing, and explain to your brother and friends that someone could get really hurt. Probably your brother and friends don't realize how painful this is, and once you tell them in a serious way to stop, they will treat you with more respect. Tell them when everyone is calm, before the hitting starts. Little brothers will always tease, but they usually don't really want to hurt you. So stand up for yourself and get help from an adult if necessary. Bruises will usually get better within a week, so if you don't see an improvment, you need to see a doctor.
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