MEN1 and Birt-Hogg-Dubé syndrome: In addition to MEN1, the genodermatoses associated with collagenomas include familial cutaneous collagenoma, Birt-Hogg-Dubé Syndrome, Buschke-Ollendorff syndrome, proteus syndrome, and TSC, in which the collagenoma is known as a shagreen patch (33, 36).