Protein is important as most of the cells are made from protein. Vitamins involved include vitamin A (for replacement of epithelial tissue), the B vitamins (which act as coenzymes), vitamin C (involved in collagen production, strengthening and forming new blood vessels), vitamin D (particularly for healing associated with bones), vitamin E, and vitamin K for the production of proteins involved in blood clotting.
As you can see, vitamin A is but one vitamin involved in wound repair. All the nutrients are needed to optimise the healing process and prevent scarring. Oral vitamin A, within the recommended or maximal daily allowances, is a better option than topically applying vitamin A.