One of the most important factors when considering eyebrow transplant candidacy is the cause of hair loss. If eyebrows are sparse due to genetic conditions, over plucking, or injury, hair transplant surgery is likely to be a viable solution. In these situations, transplanted hair follicles should successfully take to the transplant site and lead to reliable hair growth in the area. While many of the most common causes of thin eyebrows should respond to hair transplant treatment, there are some conditions that could exclude someone from being an eyebrow transplant candidate. For instance, if the eyebrows have thinned as a result of alopecia areata or frontal fibrosing alopecia, transplant surgery may not be as successful. Alopecia causes the immune system to attack hair follicles, resulting in bald patches or complete hair loss. Since this condition could compromise treatment results, our surgeons have to consider eyebrow transplant candidacy on a case-by-case basis.