Hello. Great question - well-articulated and nicely photo-documented. I do, indeed, see the concern that you have. As you acknowledged, all faces have some natural asymmetry. Although it is widely believed that facial symmetry is an important component of facial beauty, this is not exclusively the case. On some faces, it is the asymmetry itself that lends a unique beauty. However, you have this concern, it frustrates you, and you would like some answers. There are many possible reasons for brow asymmetry, here are a few: 1) Our body is unconsciously "compensating" for some type of an eyelid raising problem - perhaps a "ptosis" of some sort. It does not appear that you have a ptosis; your eyelids appear to be open the same amount. 2) We have some weakness or injury to the neuromuscular mechanism that raises the brow itself - on the lower brow side. This is most often an injury to the frontal (or "temporal") branch of the facial nerve. With no history of facial surgery or facial trauma, and a normal functioning nerve at least through age 17, such a unilateral injury is unlikely in your case. 3) An asymmetric application of a neuromodulator such as Botox cosmetic. This is not the case with you - in 5 years, your problem hasn't "resolved". 4) This is a "habit" that you have fallen into more of less unconsciously. Given your focused efforts to correct this issue, that habit-reasoning is also unlikely. 5) There is some "other/stranger" mechanism in place here, that a thorough medical exam may uncover - a visit to a qualified facial plastic surgeon (or even a neurologist) may be the first step in that possible workup.As for correction, you have some choices here as well. 1) Well-placed neuromodulator such as Botox or Dysport could effectively, temporarily, lower the hyperactive side and provide some symmetry. This will likely create some of the same eyelid hooding that you mentioned you notice in your lower-brow side. If you treat only one side with Botox, other asymmetry will be episodically noticeable in certain facial expressions. 2) Brow lift. The best brow lift for the correction of asymmetry is the transfollicular brow lift in which the incision is made just behind the hairline, the forehead and brows are released and the brows are raised and re-positioned to a symmetrical position. This is a reliable procedure, that many of us do in-office without general anesthesia.