Hi @fruzsina, I’ve been reading about this recently as my (also diabetic) dad has Dupuytren’s contracture. Lots of things I read suggested that this and carpal tunnel are more common in diabetics generally, either because of the same sort of nerve damage from high BG levels that causes neuropathy or because of our usual higher susceptibility to multiple autoimmune conditions. So although it’s worth exploring whether the type of insulin you take is a factor like @lizz‘s, it might be a complication of the diabetes rather than the insulin.