Contractubex is indicated for hypertrophic and keloid scars. It contains allantoin, heparin sodium and onion extract.
Allantoin (an anti-inflammatory), softens keratin (keratin is a protein that makes skin and nails tough) and has soothing effects.
Heparin is an anticoagulant, anti-inflammatory and it has an inhibitory effect on fibroblast proliferation.
Onion extract is an anti-inflammatory and has an inhibitory effect on fibroblast proliferation. Fibroblasts are cells that synthesize collagen and build the the extracellular matrix.
In some studies onion extract showed efficacy and in others it did not (as in this one below):
Onion Extract Gel Versus Petrolatum Emollient on New Surgical Scars: a Prospective Double-Blinded Study
BACKGROUND:
Cutaneous scars resulting from surgical procedures can be erythematous, hypertrophic, pruritic, painful, or cosmetically unacceptable. An onion extract-based topical gel (Mederma, Merz Pharmaceuticals, Greensboro, NC, USA) has been marketed as a product to improve scar appearance and texture. However, few data are available to substantiate these claims.
CONCLUSION:
Petrolatum-based topical agents constitute standard therapy in the management of postoperative wounds. In this side-by-side, randomized, double-blinded, split-scar study, the onion extract gel did not improve scar cosmesis or symptomatology when compared with a petrolatum-based ointment.
I think Contractubex is worth trying on hypertrophic scars, applied directly after needling.
Its main indication is to prevent the formation of hypertrophic post-surgery scars and to promote the formation of normal post-surgery scars.