All three methods listed are very effective in correcting plug surgery but the second and third options are the most effective. They are also the most intrusive and because of the invasiveness are usually discarded in favor of FUE. Regardless, all three procedures should be carefully considered before undergoing plug correction surgery.
Scalp reduction and flap surgeries are more difficult to repair as the work performed cannot be reversed like plug surgery can. The result of such procedures creates scarring and unusual hair growth angles that are difficult to style. The only thing that can really be done for these procedures are camouflage and fine tuning.
Flap procedures usually result in the patient having a very thick hairline because of the nature of how the procedure is performed. Unfortunately this density comes at the cost of naturalness as the hair angles are reversed from what is found naturally and the hair points backward. A scar is also usually evident. FUE is the preferred method of improvement as this allows for the hairline to be softened by removing some of the follicular units in the hairline. The hairline can also be lowered (if necessary) to create a softer transition zone as is found on natural hairlines.
FUSS can be used to correct flap and scalp reduction procedures but their use is usually limited as both procedures reduce the patient’s donor laxity. If only one procedure has been performed then laxity is not usually a problem but most patients that have had flaps and/or scalp reductions have had more than one of either or both so this is why laxity is usually compromised.
Scalp reductions in particular will reduce donor laxity the most but they do not affect the frontal hairline like flaps. Scalp reductions have one purpose, to remove bald scalp. The manner in which the bald scalp (usually the crown) is removed results in a scar formation that resembles the Mercedes Benz logo. Again, FUE is the preferred method of repair due to the reduction of donor laxity preventing FUSS from being an obvious option. Repair usually involves filling in areas of continued loss but the primary goal of scalp reduction repairs tends to be scar camouflage, for which FUE is perfectly suited.
Hair transplant repair will also include repair of mini/micro strip surgery, the precursor to FUSS (follicular unit strip surgery). Mini and micro graft surgeries were a massive leap forward when trying to create natural hair transplant results for patients but as with any cosmetic surgery some clinics were better than others when performing this procedure. In general, mini and micro graft surgery is not an inherently bad procedure as natural results could be achieved but the challenge with this procedure was achieving proper density in one surgery. This was due to the size of the grafts being placed as placing too many in one area would result is compromised blood supply and follicular damage or even destruction.