Is Master Roshi really bald? This question arose when I was watching Krillin vs Jackie Chun who is Master Roshi. When Yamcha pulls the hair thinking it is a wig, but it won't come off, then he thinks it is real hair and asks that then the bald one should be a wig? Please, could anyone explain?
Yes, Master Roshi is really bald. He mentions it himself in Chapter 25:



In the first tournament, he used a special glue to attach his hair. He mentions it when revealing his identity to Nam, who was just defeated by Goku (Chapter 46):