Hi , since it is just a week your stiches have been removed, Iwould advise you to wait.
because of injury
to the lip your neurons have got damaged. so for fewdays it is common to feel numbness
.repair mechanisms are active and sensation will be back but the time taken depends on the extent of damage.Also a scar taks about 6 months to shrink. so wait till then for any further surgical intervention.
till then you can use moisturiser , or vit E cream
But if there is some discharge or gaping you contact your plastic surgeon immediately
Hope this adresses your concern