Blotch and black lines on nail

Patient : Hi Over the past few months I have noticed a small vertical black line on both my thumb nails. On my right thumb a pearly looking blotch (3mm x 4mm approx) is also developing. I consider myself healthy, regually exercise and eat a varied diet. I do however bite my nails a little if this makes a difference. Can you please help? Thanks Tim
Symptoms:  only visual
Images: 
Blotch and black lines on nail-1
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