"Allergic reactions to suture materials are rare and have been specifically associated with chromic gut. However, Johnson and Johnson mention known triclosan allergy as a contraindication for use of certain sutures. Contact allergy to triclosan is uncommon.
Surgical gut suture (Plain and Chromic) is contraindicated in patients with known sensitivities or allergies to collagen or chromium, as gut is a collagen based material, and chromic gut is treated with chromic salt solutions.
Surgical Stainless Steel Suture may elicit an allergic response in patients with known sensitivities to 316L stainless steel, or constituent metals such as chromium and nickel. Skin staples are surgical steel so should be used with the same precautions."
Suture Allergies Revisited. Suture for a Living, 04/2008.
Image source: Surgical suture on a needle holder. Packaging shown above. Wikipedia, public domain.