Why are my nails yellow after removing dark polish?

Pigment stained the surface of the plate because it was applied without a base coat. It is cosmetic, grows out, and a base coat prevents it next time.

Can I get a pedicure if I have toenail fungus?

See a doctor first. We can usually still perform a gentle pedicure but will not apply polish or enhancements over an infected nail.

Do white spots mean a calcium deficiency?

No — that is a long-standing myth. They are usually small injuries to the nail matrix and disappear as the nail grows.

Nail Care · 7 min read

Yellow, White or Ridged Nails: What the Colour Is Telling You

Published September 6, 2026 by the team at Nail Bar 12

Healthy natural nails prepared for a manicure at Nail Bar 12, Lake Worth FL

A nail changes colour for many reasons, and only some of them are medical. Understanding the pattern — which nails, what colour, whether the texture changed too — usually points to the cause quickly.

Staining from polish

Dark reds, blues and blacks worn without a base coat leave a flat yellow-orange tint on the surface of the plate. It affects the nails you painted, it is even, and the nail stays smooth and normal thickness. It grows out in a few months, and a base coat prevents it entirely.

Signs that suggest a fungal infection

Thickening of the nail plate, not just a colour change.
Crumbling or powdery debris under the free edge.
Yellow-brown discolouration that starts at one edge and spreads inward.
The nail lifting away from the bed.
Usually toenails, and often one or two nails rather than all ten.

Clean, healthy toenails after a pedicure at Nail Bar 12 in Lake Worth — Healthy nails are smooth, uniform in thickness and firmly attached to the bed.

White spots and lines

Small white spots are almost always leukonychia — tiny air pockets from a minor knock to the matrix weeks earlier. They are harmless and grow out. Horizontal grooves across several nails at the same point (Beau's lines) usually follow an illness, a fever or a period of significant stress.

Vertical ridges

Fine vertical ridges are a normal part of ageing, like fine lines on skin. They can be softened with oil and a ridge-filling base coat. Do not buff them flat — that thins the plate and makes the nail more fragile than the ridges ever did.

When to see a doctor

A dark brown or black vertical stripe that is new, widening, or extends into the skin.
Redness, swelling and pain around the nail fold.
A nail separating from its bed without an injury.
Several nails changing at once, which can reflect a systemic issue.

What we do at the salon

Technicians are not medical professionals and we do not diagnose. If a nail shows the signs of infection, we will decline enhancement services on that nail, keep the rest of the service gentle, and recommend you see a doctor or podiatrist. It protects you and every client who sits in the chair after you.

Frequently asked questions

Why are my nails yellow after removing dark polish?: Pigment stained the surface of the plate because it was applied without a base coat. It is cosmetic, grows out, and a base coat prevents it next time.
Can I get a pedicure if I have toenail fungus?: See a doctor first. We can usually still perform a gentle pedicure but will not apply polish or enhancements over an infected nail.
Do white spots mean a calcium deficiency?: No — that is a long-standing myth. They are usually small injuries to the nail matrix and disappear as the nail grows.