I had Restylane Lyft placed under eyes a month ago I have a little bump now ( pimple like) under my eye,what should I do?

Hello,
I would prefer Restylane over the Restylane lyft for any correction around the eyes. Meanwhile, I suggest to wait for about two weeks as in most cases the swelling will go down. If you still experience the bump or irregularity then you should return to your doctor and consider dissolving the Restylane for the optimal result.
Good luck

Thank you for your question.  It's difficult to make an exact diagnosis without assessing you in-person, or at least reviewing your photos.  That said, the tear troughs and under eyes are among most complex areas to inject with filler, and require a great deal of expertise.  Filler injections here should really only be performed by experienced cosmetic dermatologists or plastic surgeons.
Generally speaking, Restylane Lyft is firm gel with large particles of hyaluronic acid, and is primarily used for deeper injections to lift and contour the cheeks.  Lyft is too firm of a product for use under the eyes in most patients - the skin here is very thin, and with superficial injections, Lyft can cause visible lumps.  It's also possible that you may be experiencing an infection at your injection site.  I would recommend following-up with your injector to discuss your concerns.  You may need to have a medication called hyaluronidase injected in the area to dissolve the filler.  If your injector is unwilling to help, please see a cosmetic dermatologist or plastic surgeon for a second opinion.  Best of luck.