Introduction to Hypersensitivity and Reactive Skin Disorders

The immune system plays a significant role in most skin disorders. The following skin disorders can be primarily characterized by a hypersensitivity or other type of reaction, be it to a drug, infection, or cancer:

• Acute febrile neutrophilic dermatosis

• Drug eruptions and reactions

• Erythema multiforme

• Erythema nodosum

• Granuloma annulare

• Panniculitis

• Pyoderma gangrenosum

• Stevens-Johnson syndrome

• Toxic epidermal necrolysis