Dear Doctor my name is najila.I have a sister.her age is 19.my sister is a abnormal child by birth.she is taking her medicine.she can't able to walk or talkshe offenly get fix.she is like a 2 month baby now.her weight is 20kg,but height is normal to her age.she attend her age at 15 years.For three years she had a normal period.For past one year her period date is imperfect.she got her period only three month once.for past one month her size of her one breast is very big.it becomes very hard.it is really painful for her.iam worried that it can be a cancer.so please answer to me.what type of breast problem is this.and what I have to do next.