Why does my silicone sub-muscular implant feel like it has sharp points just above the bottom of my crease? 3.5 mo post op.

All implant ripple and fold and when that happens, a sharp edge of the fold can be felt through the skin.  Massage the breast to stretch the capsule to create a larger open space for the implant and that should help.  Try lying on your stomach so that the weight of your body compresses your breasts - massage with you doing much.

The bottom of the muscle during a sub-muscular breast implant is left open so that the edge of the implant can pressed against the skin just above the inframammary fold.  Most likely while you are feeling is a fold under your silicone implant.  Please see her plastic surgeon for an examination and diagnosis and ask if breast implant displacement exercises may help.

Thank you for your question and I agree with Dr Seckel that you are more then likely feeling a fold in your implantDr Corbin