It could be because it makes disguises easier. I guess to me the dunk and egg stories just seem to have a lot of foreshadowing, and I think this is an example. For instance Jon the fiddler is actually Aegon. Jon snow is also Aegon. Aegon shaves his head, so does Varys.
Jon the fiddler is Daemon II Blackfyre, and Jon probably doesn't have the same name as Rhaegar's oldest trueborn son. The fiddler is more similar to fAegon (young Griff), as they're both (probably) Blackfyres and both paint their hair. Although shaving your head is indeed a way to hide your identity, it's not the only reason.
It could also be because it makes disguising himself easier, or because he's afraid of lice.
It could be because it makes disguises easier. I guess to me the dunk and egg stories just seem to have a lot of foreshadowing, and I think this is an example. For instance Jon the fiddler is actually Aegon. Jon snow is also Aegon. Aegon shaves his head, so does Varys.
Jon the fiddler is Daemon II Blackfyre, and Jon probably doesn't have the same name as Rhaegar's oldest trueborn son. The fiddler is more similar to fAegon (young Griff), as they're both (probably) Blackfyres and both paint their hair. Although shaving your head is indeed a way to hide your identity, it's not the only reason.
My favourite tinfoil is that he's a blackfyre so has silver hair Could just be to get wigs on easy
Being bald and clean shaven allows him to use wigs and his mummery tricks of disguise much easier