After finishing 4 X AC chemo...I had four distinct lines which were dark, horizontal (so side to side). These are called "Beau Lines" During the 12 X Paclitaxel chemo, my finger nails started forming ridges which went the other way...so from cuticle to fingertip....almost like corduroy. The beau lines were still there, but grew out one by one. With my toenails, the big toe on the right foot went a horrible grey/brown/ chalky colour and formed large flakes like fish scales. I also developed pus under the nail (paronychia), which was drained three times and also required antibiotics. That same big toe nail is still deformed, and large chalky flakes and lumps regularly fall off. I've lost the entire nail three times altogether over the last four and a half years. My fingernails still have the ridges which I make smooth with a fine emory board.