hi..thanks for your query.
The treatment for scars
depend on the nature, depth and extent of the injury
and the scarring process.Depending on the same, there are several treatment options ranging from creams to surgical methods.
Non invasive methods of scar treatment include topical self drying silicone gel and topical silicone gel sheetings.These are safe and effective treatments for hypertrophic and keloidal scars. Unfortunately, for the nature of the scar you mention,this will have not much use.
As for invasive methods, there are several options like subscision,excision of the scar tissue by punch excision and suturing,injection of filler substances.You should visit a plastic surgeon to assess the nature and degree of scarring as the exact modality can only be suggested on inspecting the area and the dimensions of the scar.
hope this helps.take care!