What is a connective tissue naevus?

A connective tissue naevus (American spelling nevus) is an uncommon skin lesion that occurs when the deeper layers of the skin do not develop correctly or the components of these layers occur in the wrong proportion. There may be too much collagen; this is called a collagenoma. Or there may be too much elastic tissue; this is called an elastoma. The naevi may also include excess glycosaminoglycans (ground substance of the dermis), excess smooth muscle or excess fat.

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Source: dermnetnz.org