Up to 30% of people with chronic hives (also known as chronic urticaria) have an underlying autoimmune disease that affects the thyroid gland in the neck. Chronic hives are especially common in people ...

Enlarging purple pruritic nodules on the dorsal neck One month after a painful neck rash, an HIV-positive man develops pruritic purple lesions at the same site. A 34-year-old African American man ...

Inverse pityriasis rosea usually causes a rash on the armpits, groin, neck, or face. The rash may clear up on its own, and medications such as antihistamines can help with itching. Inverse pityriasis ...