my hair was not as pretty when i had UC (colon is gone now, so UC is too, WHOO HOO!) anyway, i took asacol and it didnt' seem to make a differnce, the pred and the actual flares did for me, but whenever you have a disease it affects your fingernails and hair first, at least outwardly, also your skin will change. This is a random fact, but one of the ways they tell about the lives of people found frozen (like that mountain guy from thousands of years ago) is by looking at his fingernails they can tell that he had several times of bad health.
The good thing is that hair grows out, and the damage is to the hair that is there, not to the hair that is coming, does that make sense? and if you get better, or the dose gets lower, the hair that comes next, should be better. Hair grows in three month cycles