Meanwhile, my 40 year old sister who still bites her nails will sometimes go a week without biting and hers grow out perfect.
Both of his big toes have big cracks from base to tips and turn inwards at the edges like ingrown toenail.
Fungal infection can also cause the development of these lines.
With alopecia areata, patients lose patches of their hair, usually hair on the scalp.
Should this condition persist, it might be wise to a see a doctor for guidance.
Treatment of nail psoriasis: Best practice recommendations from the Medical Board of the National Psoriasis Foundation.