I want to remove the screws (of Endotine) after 1 and a half years. Is it available and difficult?

Endotines are absorbable devices which should no longer be there. The lump you feel is likely some residual scar tissue from your procedure. Obtain a consultation from a board certified plastic surgeon. Bring them a copy of your surgeon's operative note as well as the pictures of what you looked like before surgery.

It is doubtful that you have residual Endotine material at this time.  An XR of your cheek could determine if you have a residual foreigh body.  There could be many different reasons for residual pain.  Seek an experienced plastic surgeon for evaluation. 

Any foreign substance in the face over time will be ineffectual and can create secondary problems. Removal can be problematic.

It is always best to  return to your original surgeon. In general the endotine device screws are dissolvable. 

The symptoms you are experiencing are not likely related to the presence of an Endotine device at this point. The device should have been completely absorbed by now.  Scar tissue may have formed in the area of the device as the area healed and can be causing symptoms.  If a "metal" screw was placed, it was not a part of an Endotine device.  You should get a copy of your operative note to know exactly what was done and consult a board certified plastic surgeon familiar with the use of Endotines

Sorry to hear about your predicament.  Prior to the introduction of long lasting, malleable fillers, such as Voluma, Radiesse, Juvederm UltraPlus, etc. I used to offer mid-cheek lifts, using Endotine devices, which are composed of a polymer of lactic acid.  The absorption time is estimated to be approximately 6-9months.  The lump below your left cheek bone could represent some of the midcheek fatpad, which was formerly engaged by the "tines" or claws of the device.  The "tail" of the device was fastened to the temporal fascia and this may have contributed to your headaches. I would not recommend trying to surgically remove Endotine remnants but rather concentrate on identifying and treating entitites responsible for your headaches.  

To answer your questions it truly is best to be examined first. Find a Board Certified Plastic Surgeon who will help you understand what is going on and how to potentially resolve it.Good LuckStephen M. Davis, MD, FACSGreen Hills Plastic surgery

The endotine devices are made from absorbable material. I would talk to your surgeon about specifics with your case. If there is any residual material remaining, I would expect it to dissolve.

The Endotine device is usually fixed with absorbable screws which would not be present 18 months after surgery. Consult with your surgeon re your present problems.