Knot on forehead/eyebrow - Is this normal? (photo)

CT scan is the best way to find out about the nature of this prominence, mass. Providing that this is just a bone prominence, correction of deformity would require incision at or just behind the hairline and shaping of the bone with a burr. Although this sounds very dramatic, it is done in twilight anesthesia with minimal recovery. In person or teleconference consultation with a board certified plastic surgeon familiar with this procedure is recommended. Good luck.

Based on your two posted photos in your history of long-term lateral right forehead mass recommend a scan or ultrasound to determine if that is a bony or soft tissue issue. Then seek in person or virtual consultation with board-certified Plastic Surgeon since this area is the location of the frontal branch of the facial nerve that gives muscle action to the forehead and brow. Only surgical excision can be offered, and this has to be done in a in the hands of a boarded Plastic surgeon . Regards again best virtual consult with.