When Kenalog Injections Dissolve Ridging (Raised Hairline) Due to Hair Transplantation, Does the Ridging Ever Reoccur Again ?

Steroids can help with scarring.  It can also make it worse, cause discoloration.  You need an examination and an understanding of what is realistic and the risks.

It should not return. Steroids work by inducing atrophy. This is typically permanent. Also find comfort in knowing that the injections could be repeated as needed.

Usually if the kenalog injection reduces the ridge it is fairly a permanent improvement.

Usually, if the steroid alone handles the ridging, it does not come back. This is a general rule but does reflect my massive experience treating these types of complications from other clinics

More than likely the ridging condition will recur in 6-12 months if you, indeed, get an improvement.