There are many types of myositis

Types of myositis include:

• myositis ossificans
• fibromyositis
• idiopathic inflammatory myopathies
• dermatomyositis: A rash usually accompanies or precedes the muscle weakness
• juvenile dermatomyositis
• polymyositis : chronic muscle inflammation accompanied by muscle weakness affecting proximal
• inclusion body myositis: chronic, progressive muscle inflammation accompanied by muscle weakness affecting proximal and distal muscles
• pyomyositis