How long does a steroid injection take to work for nail psoriasis?

The injection places corticosteroid into or near an affected nail area to reduce local inflammation. Less tenderness, swelling, or separation may be noticed before the nail surface looks clear. Ridges, pits, discoloration, or thickening already present cannot disappear immediately; they move forward as healthy nail grows from the base. Fingernails and toenails also grow at different speeds, so the timing varies by the nail involved, the extent of disease, and whether psoriasis remains active elsewhere.

Follow the planned appointment schedule and avoid picking, biting, or aggressively cleaning beneath the nail. Keep nails trimmed and protect them from repeated wet work, knocks, and harsh chemicals. Tell the clinician if the treated area becomes increasingly painful or if the skin changes noticeably. Take photographs under similar lighting so gradual growth is easier to compare. A clinician may review the nail after enough new growth has appeared and decide whether another approach is needed.

Contact the treating clinician promptly for spreading redness, warmth, pus, marked swelling, worsening pain, or fever after an injection. Seek assessment for a dark streak, bleeding, or rapid nail destruction rather than assuming it is psoriasis. New changes can have other causes, including infection or injury, and an examination helps separate them from treatment effects.

Which nail changes are you treating, and when should I expect new growth to show them? What signs would suggest infection or another nail problem? How should I protect the nail between appointments?