i agree, the best way for others to help you with your problem is posting a photo.
PLEASE make sure that you watch all of your other fish as well to check and see if they develop a white spot. if this is so, increase water quality and do water changes more frequently.
"IF," you deffinately know that its Ick, check out some anti-bacterial stuff at your
LFS. You might want to get some anti-bacterial stuff anyway just as a precuation add add small amounts. this way your improving the water quality and if it is Ick, containing it.
Check with a moderator that i have given the right advice.