Primary osteomas (15%)

Secondary osteomas (85%)

Syndromes associated:

·      Fibrodysplasia ossificans progressiva

·      Albright’s hereditary osteodystrophy

·      Progressive osseous heteroplasia

·      Gardner syndrome

Cutaneous tumor:

·      Basal cell carcinoma

·      Pilomatricoma

·      Naevi

·      Hemangioma

Non-associated:

·      Solitary small osteoma

·      Solitary large osteoma, plate-like osteoma

·      Multiple widespread osteomas

·      Multiple military osteomas on the face

Inflammatory process:

·      Acne

·      Dermatomyositis

·      Sclerodema

·      Myositis ossificans