Hives are a common result of allergic reactions. In addition, physical factors, systemic diseases and hormonal changes can also result in hives.
Urticaria Nature Reviews Disease Primers
Psoriasis - Symptoms and Signs
List of drugs/medicine used for Psoriasis (Skin Disease - Psoriasis)
Chronic Spontaneous Urticaria (Diagnosis and Management) - Private
Tips for diagnosing, treating urticaria
Urticaria (Hives): Signs, Symptoms, and Complications
urticaria-skin inflamations
Skin Disease/ Dermatology - Skin Pigmentation Disorders
PDF] Acute and Chronic Urticaria: Evaluation and Treatment