Abnormal nails : See below regarding black lines- which to some could appear grey. https://www.healthline.com/health/black-line-on-the-nail#outlook Can be splinter hemorrhage - benign or autoimmune like psoriasis which is also associated with pitting (dents) in fingernails and rash/flaking , or due to endocarditis -infection on heart valve ( more serious). F/u/ w/ dermatology
Answered 12/19/2019
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