Eyebrow follicles are slow growing anyway so it takes time for them to recover from any disruption in growth. Mostly it is a question of patience. Of course if the cause of the thinning is still present then the thin growth may persist.
If the burn injury did not damage the eyebrow hair root, the eyebrows will regrow. If the burn injury destroyed the hair root, eyebrows will not grow back.
Eyebrow Regrowth tips
Effect the hormones,which can stimulate hair growth. in the case of hair growth will not be limited to brows,if the product work.
Blood vessels to increase the flow of blood and nourish the follicles.
Eyebrow follicles are slow growing anyway so it takes time for them to recover from any disruption in growth.
Three alternatives are available if eyebrow loss is permanent:
1) hair plugs removed from the scalp and transferred to the eyebrow area,
2) cosmetic tattooing in the shape of eyebrows, and
3) the use of camouflage cosmetics to draw eyebrows onto the face with makeup