Which is better for neck keloid scars treatment spectra gel or contractubex gel?

Depends: If you truly have a keloid there is really not much any of the topical scar treatments can offer. A keloid scar is one that has growth larger than the original site of "injury." they can arise from prior surgery or even trivial injuries like an insect bite. Before you spend too much money on over-the-counter remedies i would see a plastic surgeon or dermatologist.