Not sure about the term ‘fibromatose’, but this is my ELI5 answer:
The nail plate (commonly known as your ‘nail’), attaches to the nail bed (soft stuff underneath) which is composed of soft tissue called epithelium. This tissue is made of many layers, starting with a ‘basement layer’ and becoming more compact with each layer: this is where your Nail grows from. Even though it grows from the base of the nail bed, it is still connected through the ‘basement layer’ (just like all the rooms in a house are still connected to the basement in some form)
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