There are various disorders where dermal material is extruded through the overlying epidermis. eg Pseudoxanthoma elasticum, Elastosis perforans serpiginosa and sometimes granuloma annulare.
Chronic renal disease can lead to a perforating disorder as can Kyrles disease and perforating collagenosis.
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| Perforating Granuloma annulare Globalskinatlas |
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| Kyrles Disease GlobalSkinAtlas |
