Nails can change after an injury, with aging, or because of a skin or health condition. Some changes improve as the nail grows, while others persist, spread, or come with pain. A dermatologist can examine the nail and surrounding skin, consider possible causes, and recommend appropriate testing or care. Knowing which signs to watch for—and what happens at a visit—can help you decide when to seek professional advice rather than relying on guesswork.
Changes Worth Having Checked
Arrange an assessment if a nail develops a new dark stripe or spot that does not grow out, especially if the color reaches the surrounding skin or the mark changes over time. Pigment under a nail can have several causes, but a clinician should evaluate a persistent or changing mark. Do not try to diagnose it from a photo alone.
Other reasons to book an appointment include nails that become thick, brittle, unusually curved, deeply ridged, or separated from the nail bed without a clear injury. A nail that repeatedly splits or changes color may also need attention. These signs are not proof of a serious condition, but an examination can help identify whether treatment or monitoring is appropriate.
Pain, Swelling, and Infection Signs
Seek professional advice for ongoing nail pain, tenderness, swelling, or redness around the nail. Pus, warmth, or worsening discomfort can point to infection. A nail that lifts from the nail bed may trap debris and become irritated, so avoid digging underneath it or applying strong chemicals while you wait for guidance.
Get prompt medical care if redness spreads, pain becomes severe, you develop a fever, or you have diabetes, poor circulation, or a weakened immune system and notice a possible nail infection. These circumstances can raise the risk of complications. If the problem began with a significant crush injury or the nail is badly damaged, a clinician can assess the injury and advise on next steps.
What Happens at an Appointment
The dermatologist will ask when the change began, whether it is getting better or worse, and whether it affects one nail or several. Be ready to mention pain, itching, recent injuries, nail products, and treatments you have already tried. Sharing relevant health conditions and medications can also help the clinician assess possible causes.
The clinician will examine the nail, nearby skin, and sometimes other nails. Depending on what they see, they may recommend observation, take a small nail clipping or scraping for testing, or discuss another evaluation. Not every nail change needs a test or procedure. Ask what the exam suggests, what to watch for, and when to follow up.
How to Prepare and Protect Nails
Take clear photos of the nail over time, using similar lighting and including a size reference if helpful. Bring a list of products and treatments you have used, along with the dates of any injury or noticeable changes. If you use polish or artificial nails, ask the clinic whether to remove them before the visit so the nail can be examined.
Until you are assessed, keep nails clean and dry, trim broken edges carefully, and avoid cutting or pushing back the cuticle. Do not share nail tools, and avoid covering a changing nail with polish if that makes it harder to monitor. These steps do not replace medical care, but they can reduce irritation and make changes easier to track.
A nail change that persists, spreads, hurts, or affects the surrounding skin is worth discussing with a dermatologist. Early assessment can clarify what is happening and whether treatment or follow-up is needed. If you have concerns about a nail, contact Boulder Nail Dermatology to ask about arranging an evaluation.