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keto twenty one Jaundice caused by impaired liver function.Fungal
infection.Diabetes Concave nails. When the nail plate becomes too thin and
brittle and loses its natural convex shape, the nails become concave,
spoon-shaped. This phenomenon is called coilonychia.How it looks: Soft nails
are flat, hollowed out or concave. The recess in the nail plate is large enough
to fit a drop of liquid.Possible reasons:Iron-deficiency anemia.Hemochromatosis
(an excess of iron).Plummer-Winson Syndrome (SPV).Raynaud's disease.Systemic
lupus erythematosus.Acute rheumatic fever.Drum fingers.Deformation of the nail
plates, in which they acquire the characteristic appearance of watch glasses,
occurs due to an increase in the layer of soft tissue under the nail bed. As a
result, the fingers look swollen.