Supplements with too much Vitamin A can be toxic to the liver since Vitamin A is a fat soluble vitamin (meaning more gets stored than excreted.) Sweet potatoes and other foods rich in Vitamin A, however, do not cause liver toxicity and can not be stored for long-term use like supplements can.
The wound healing stages are made up of three basic phases: inflammation, proliferation and maturation. There are many types of wounds that require different wound care products for proper recovery from an ulcer or laceration, but most go through similar healing stages.
Eventually new skin forms beneath the wound and heal the wound site from the bottom up. The new skin is commonly yellowish and fairer than the scrapes, which appear red and inflamed. With minor skin, new skin cell formation is usually elapsed for the first 2 to 3 days. On day 4 or 5, the wound edges begin to heal.