I've had recurring hives for the past 6 months, especially when it's cold, after eating seafood, or drinking milk. Allergy medication only provides temporary relief. Is this a sign of an immune disorder? (Huy Anh, 34, Dong Thap)

Quan, 28, experienced painful, red bumps on his legs for six months. Doctors diagnosed him with erythema nodosum, a condition where the immune system mistakenly attacks subcutaneous fat.