About breast enlargement injection. Is it OK? Will I get side effects?

In your question, it is not entirely clear what it is you will be having injected into your breasts.  You mention a "fa breast enlargemnt injection".  If you are having fat injected into your breasts by an experienced surgeon who is well trained or experienced in fat injection into the breasts, you should be fine.  If you are having anything but fat injected, I would highly advise against it.  Best of luck!

If you are speaking of injections with your own fat (free fat transfer), this may be a reasonable alternative to a small breast implant.  However, this is a surgical procedure and does carry the normal risks of a surgery - bleeding infection, fat resorption, etc.  If you are speaking of injections with something like silicone or oil products, this should not be done at all.  This procedure is prohibited in the U.S. because there is a significantly high risk of inflammation, infection, and possible skin and/nipple necrosis (death) associated with this procedure.  These problems can occur shortly after the injections or years later.  Do not allow any foreign material to be injected into your breast.  Best wishes, Dr. Lepore.