sounds like shin splints to me!
basically shin splints are muscle soreness of the tibalias anterior muscle, or in the extreme, it could be tears at the insertion points.
http://www.exrx.net/Muscles/TibialisAnterior.html
assuming that you just have a soreness there that is brought on by exercise,
which can be very painful, the best thing to do is rest the muscle.
good shoes are essential as well.
if you are doing aerobics or running everyday, you need to take days off in between to let thta muscle fully recoup. try every third day until you can go pain free and then reduce it to evey other day etc...