Could a pill cure baldness?

Researchers may have accidentally found an answer to one of life's biggest mysteries: the elusive cure for baldness.

A man went from completely bald to a head full of hair in just months, and all thanks to a little pill meant to treat arthritis.

"I've gotten a lot of comments about how great my hair is coming in and what a lovely color of hair it is. I find myself a lot of times just playing with it," said Kyle Rhodes.

What was the trick? No, not Rogaine or Propecia. They grow hair only on parts of the scalp. It was a drug called Xeljanz that is already on the market for arthritis.

Rhodes' doctor at Yale University decided to give it a try. Eight months later, he had a full head of hair.

Rhodes, 25, starting losing hair all over his body at the age of 2 because of an unusual form of Alopecia.

"Neighborhood kids at school, just jokes, Rogaine comments. One thing I did get when I was completely bald is called a skinhead, which I found very offensive," Rhodes said of his bullying.

Now, even his eyelashes and eyebrows are back. There are 6.5 million people with skin diseases like Rhodes, and his doctor says the drug may one day help them too.

But what about the tens of millions of men who have gone bald as they've gotten older? The doctor doesn't think the drug will help them, but he does think it's worth doing a study to find out.

The drug can have serious side effects. Kyle hasn't had any, and he's enjoying his new head of hair.

"I've always wanted an 80's hockey mullet so maybe going towards that," Rhodes said.

But why would an arthritis drug help hair loss?

The doctor thinks it's because arthritis and some forms of Alopecia are related to the immune system.

The drug is not cheap. Without insurance it can cost an estimated $25,000 each year. Rhodes said his insurance pays for most of the cost.