What if oral antifungal treatment does not relieve thickened nails?

A nail can remain bulky, yellowed, ridged, or crumbly after the active problem has improved because damaged nail grows out slowly. Treatment may also have targeted the wrong condition: repeated pressure, injury, psoriasis, eczema, or another nail disorder can resemble fungal change. A mixed problem is possible too. The appearance of one nail may differ from several nails, and the skin around it can provide useful clues.

Do not take extra tablets, restart a course, or extend treatment without the prescriber’s advice. Book a dermatology or primary-care review and bring the medication name, dose instructions, treatment dates, and photographs showing how the nail changed. The clinician may examine nail clippings or debris, review footwear and past injury, and decide whether a different approach is appropriate. Keep nails trimmed safely, avoid digging under them, and keep feet dry; comfortable, roomy shoes reduce repeated pressure while the cause is clarified.

Seek prompt medical care for spreading redness, warmth, swelling, drainage, increasing pain, fever, or a dark streak that is new or changing. Arrange earlier assessment if you have diabetes, reduced circulation, or a weakened immune system, because a small nail or surrounding-skin problem may need closer attention.

Could this thickening be caused by something other than fungus? Should a nail sample be checked before another treatment? How long should healthy nail growth take to become visible? What nail-care or footwear changes fit my situation?