Wound scabs fall off with depression generally may grow back, you can apply some drugs, physical methods for treatment.
In the case of wound depression after dropping the scab, it will leave a scar, you can apply some topical growth factor gel, which can promote the regeneration of the local epidermis, topical mucopolysaccharides sulfonate cream, this cream has the effect of softening keloid and inhibiting the formation of scars, and it can be used through skin abrasion epidermal cell regeneration to repair the depressed scars.
Depressions after the scabs have fallen off may be caused by the lack of subcutaneous fat tissue after the skin has healed from the injury. Subsequently, the surrounding fat tissue will gradually fill in, but it will take more time.
It can also be repaired by laser, using the principle of light and heat, which can promote the synthesis of collagen and help the damaged skin tissues to be repaired as soon as possible. It is also important to avoid scratching the skin with your hands during the treatment period, as this can lead to damage to the soft tissues of the skin.