A few months ago i was given an injection to treat carpal tunnel syndrome. since then i've had discoloration and change in skin texture, is it normal?

Side effect: Corticosteroid injections can cause skin discoloration (hypopigmentation) and change in skin texture.

Side effect: Atrophy and pigment changes are a side effect of steroid injection, especially if the steroid is placed close to the skin. The effects typically will resolve with time, but may last over 1 year.

It's not uncommon: Carpal tunnel injections usually contain some steroid solution. Steroids can depigment and/or thin the skin. The subcutaneous fatty tissue can also become atrophied with steroid use. All of these affects are typically temporary, but may take up to a year to resolve.