Can I get forehead recontouring surgery at the age of 18 with the support and consent of a parent?

There are legal issues and consent forms you must sign as an adult.  If you are 18 and over, you can consent to your own medical treatment.  However, it is always a good idea to have the support of your parents.

As a female who is 18, you can get a hairline lowering surgery. There are two types of procedures for lowering a woman’s hairline. One, is a surgical excision of the upper forehead followed by the downward advancement of the hairline up to an inch from where it was prior to the surgery. To accomplish this, the entire scalp from the frontal hairline to the very back of the crown, is lifted up and pulled forward. When this is done by an experienced surgeon, the hairline can often be advanced about 2/3rd – 1 inch if there is enough looseness when this lifting process is done. This procedure is often complete in one surgical session; however, it may not address receded corners of the hairline if the corner recession is significant. A great advantage of this surgical approach is the immediate impact of the procedure on hairline location with healing usually complete in a week or so. Sometimes this procedure produces a scar in front of the hairline, and if this is this is the case, a hair transplant in front of the hairline can address the scar. If there is corner rounding that is not addressed by the surgical lowering, then hair transplants can address this very well.  

The second type of hairline lower procedure is done through hair transplantation. The number of sessions varies by the thickness of the hair. For women with other than fine hair, they might do this in a single session. With finer hair, it often takes two sessions. The time to see the impact of a hairline lowering hair transplant procedure is 7-8 months and if a second session is required, it will take another 7-8 months to wait for full growth. 

The bossing of your forehead can be successfully removed and is appropriate for an 18 year old lady. I do this through an Irregular Trichophytic Incision that we described many years ago.