DARBOY, WI (WTAQ) - A seven-year-old Fox Valley boy is back at school for the first time in three years.
Charlie Knuth of Darboy also trick or treated last week for the first time since 2008.
Appleton Post-Crescent Media said Charlie's immune system is almost fully recovered, after he suffered a rare skin disease called Epidermolysis Bullosa, or EB.
Charlie's skin became very fragile due to a lack of protein between the skin layers.
State Medicaid officials refused to pay for his initial operation in 2010, calling it an experimental treatment. But the state changed its mind after hearing from numerous people and officials which included former Congressman Steve Kagen.
His treatments included two stem cell transplants in Minneapolis.
The Post-Crescent says Charlie's entire blood and immune systems have been donated -- along with his marrow.
His family says he still lives in pain all the time, but it's not nearly as bad as before his transplants.