Medical Oncologist
Skin and nail side effects
Paronychia and Nail Changes — on Targeted Therapy
Paronychia is soreness and swelling around the nail fold — the skin at the base and sides of your nails. It is one of the most common skin side effects of targeted therapies, especially EGFR inhibitors. Most cases are manageable at home in their early stages, but there are signs that mean call your team today.
Medically reviewed by Dr. C. Raghavendra Reddy, Medical Oncologist, MBBS (Gold Medal) · DNB · DM (Medical Oncology, Gold Medal) · Last reviewed August 2026
- A known drug effect, not an allergy — EGFR inhibitors affect the same growth signals in skin and nail cells that they target in cancer cells.
- Usually manageable early — Mild paronychia responds well to simple nail care and gentle soaks before it becomes infected.
- Can become infected — Inflamed skin around the nail fold is more vulnerable to bacteria.
- Tell your team early — Reporting at the first sign gives your team options — including a topical antibiotic — before it worsens.
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Paronychia is inflammation of the skin around the nail fold, and it is among the most common side effects of EGFR-targeted therapies. It is uncomfortable but usually manageable at home in its mild form. The signs that change it from a nuisance to something urgent are redness spreading up the finger beyond the nail fold, severe pain, or fever alongside the swelling.
If a symptom below applies to you, do not wait for a callback. Call 1800-202-8726 or go to your nearest emergency department.
How do you manage a nail infection from targeted therapy at home?
- Soak the affected finger in warm, clean water dailyA few minutes of gentle soaking softens the skin and keeps the area clean. Pat dry carefully afterwards.
- Trim nails short and file any rough edges smoothA sharp or ragged nail edge increases friction at the fold and makes inflammation worse.
- Apply a fragrance-free moisturiser around the nail foldDry, cracked skin lets bacteria in. Moisturising regularly reduces that risk.
- Wear gloves for wet or dirty tasksProlonged contact with water, soil, or cleaning products significantly worsens paronychia.
- Do not push back or cut your cuticlesThe cuticle seals the nail fold against bacteria. Removing it opens a path for infection.
- Avoid nail polish and hardeners while the nail fold is inflamedThese can irritate already-sensitive skin and trap moisture underneath.
- Tell your oncology team, even if it feels mildEarly reporting means they can prescribe a topical antibiotic before the inflammation becomes infected.
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MBBS(Gold Medal), DNB(General Medicine), DM(Medical Oncology)(Gold Medal)
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Dr. Bharati Devi Gorantla
MBBS, MD(General Medicine), DM(Medical Oncology)(Adyar,Chennai), ECMO, MRCP SCE(UK)
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MBBS, MD (General Medicine), DrNB (Medical Oncology), ECMO, MRCP SCE (Medical Oncology) (UK)
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MBBS (AIIMS), MS (Surgery) (AIIMS), DNB (Surgical Oncology), MRCS (Edinburgh)
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How do you know if your nail symptoms are getting worse?
| Feature | Mild — home care is appropriate | Moderate — call your team today | Severe — go to emergency now |
|---|---|---|---|
| Skin around the nail | Slightly red or tender to touch | Clearly swollen, skin taut or shiny | Hard, very swollen, hot to touch |
| Discharge | None, or a tiny amount of clear fluid | Yellow or cloudy discharge present | Large, tense collection of pus |
| Pain | Mild — not stopping daily tasks | Noticeable — affecting use of the finger | Severe — cannot use the finger at all |
| Redness beyond the nail fold | None | Minor irritation around the fold only | Red streak or swelling tracking up the finger |
| Fever | None | None | Present alongside any of the above |
| Typically starts | A few weeks to months after beginning targeted therapy | Any point during treatment | Any point — can escalate within days |
Why does targeted therapy cause nail changes in the first place?
EGFR inhibitors work by blocking a growth signal that cancer cells depend on. The same signal is active in normal skin and nail cells, which is why the drug affects them as a side effect.
You may notice not only paronychia but also nail discolouration, brittleness, or the nail slowly lifting from its bed. These changes are usually gradual. Mention them at each appointment so your team can track whether they are worsening.
Paronychia is not an allergy and it does not mean the treatment has stopped working. Your oncologist will weigh the benefit of continuing against the severity of the side effect — reporting early gives them the full picture to do that well.
Did you know?
Nail and skin changes are among the most frequently reported side effects of EGFR inhibitors, affecting a substantial proportion of patients who take them.
ASCO and ESMO guidance notes that the presence of these skin reactions has been linked to drug activity in some patients — making management the goal, not avoidance.
Source: ASCO and ESMO guidance on dermatological toxicity of EGFR-targeted therapies
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Common questions
Frequently asked questions
Is paronychia a sign that my targeted therapy is not working?
No. Paronychia is a side effect of how EGFR inhibitors interact with normal skin cells, not a signal about cancer response. ASCO and ESMO guidance notes that skin and nail reactions have in some cases been associated with drug activity — so their presence is not a reason to worry about effectiveness. Report the symptoms to your team so they can be managed well.
Can I keep taking my tablets if I have paronychia?
In most cases, yes. Mild to moderate paronychia is usually managed alongside continued treatment using simple nail care and, where needed, a topical antibiotic prescribed by your team. Severe or infected cases may need a short break or dose adjustment, but that decision belongs to your oncologist. Never stop or reduce your tablets without being told to — the side effect is manageable, and stopping early can affect your treatment.
My nail is turning dark and lifting away from the finger. Do I need to worry?
Nail discolouration and onycholysis — where the nail lifts from the nail bed — are recognised changes caused by EGFR inhibitors and are usually not dangerous on their own. The practical risk is that a lifted nail creates a gap where bacteria or fungi can enter and cause infection. Keep the nail trimmed short to reduce this, avoid moisture getting under the nail, and mention it to your oncology team at your next visit so they can monitor it.
Can I use an antiseptic or antibiotic cream I bought myself?
Check with your oncology team or a pharmacist familiar with your treatment before applying anything. Gentle antiseptic soaks are widely used for paronychia, but prescription topical antibiotics are often more effective for established cases on targeted therapy, and your team can prescribe these. Do not buy oral antibiotics without a prescription — they are not always needed, and using them without guidance can cause other problems.
Will paronychia go away while I am still on targeted therapy?
Often it persists for as long as you are taking the drug, because the drug continues to affect skin and nail cells throughout treatment. Many people find it becomes more manageable over time once they develop a consistent nail care routine and have the right topical treatment. If the targeted therapy ends or is changed for another reason, the nail changes usually resolve gradually over several months.