I have a cut on my forehand....please help?

How long it takes to heal will depend on how big and deep the cut is. If it's very long or deep, it could take a couple weeks. If it's not that big or not that deep, it'll take maybe a week. Scarring will also depend on the length and depth of the injury. Some cuts don't leave any scar, some leave a slightly noticeable one, others leave very noticeable ones. It all depends. If you end up with a scar and you feel it's too noticeable, you can do stuff to help fade it.