Nose picking is common habit in adults, but in most is not really a disorder. In some though, the behavior can be much more time consuming and socially compromising -- and is called "rhinotillexomania.
" these individuals may have a kind of obessive anxiety disorder
related to skin picking. It can be physically harmful too. For more, see: http://www.Ncbi.Nlm.Nih.Gov/pubmed/7852253.