People with eczema should not eat crab, as well as mutton, chili peppers, fish, and shrimp. They should also abstain from alcohol, as eczema is an allergic condition and it's difficult to pinpoint specific allergens. Foods like seafood, crab, and chili peppers can potentially trigger a relapse or worsen the symptoms. After the onset of eczema, the affected areas should not be washed with hot water. Instead, antiallergic medications should be used for treatment, such as oral loratadine tablets, and topical application of corticosteroid creams like compound flumethasone ointment. If symptoms persist long-term, it's advisable to visit a dermatology department at a reputable hospital to identify specific allergens and receive targeted treatment. Overall, eczema is a chronic condition that can recur frequently, so attention must be paid to one's diet and lifestyle habits.