Growth factors are effective when applied before scabbing, and can also be applied after scabbing, and should be applied at the right time according to the condition. 1. Apply before scabs: the main role of growth factors is to promote epidermal growth, promote wound healing, can be used for burns, scalds, traumas caused by wound breakage, apply before scabs can promote cell growth, accelerate wound healing, so that the epidermis is gradually shed, stimulate the regeneration of the skin, do not apply too thick, the local skin should be clean and dry. 2. Apply after the scab: use after the scab can make the skin damage faster healing, the lower the chance of infection, the lower the chance of scar formation. It is also important to eat a light diet to help the wound heal. Whether it is applied after or before scabbing, you need to consult your doctor before applying it to avoid damage to the skin.