Need to cover horrible patches on sholders! How?

The other day while at a baseball tournament i got a horrible sunburn on my arms. I ended up getting like blisters and everything. When those finally went away my skin was all patchy and peeling. Now normally i'd let it go away on its own but i have my Graduation on Tuesday the 28th! Does anyone have any idea how to get rid of the flaking skin, and cover up the patches so it looks like i have an even skin tone? My dress is also strapless so i have no way to hide it at all! Please help me A.S.A.P!