Nickel allergy is a common cause of allergic contact dermatitis. The reaction usually develops where skin has prolonged contact with an item that releases nickel. It is a delayed skin allergy and is not the same as an immediate food allergy.
Symptoms
Skin may become itchy, red or darker than the surrounding skin, swollen, dry, cracked or blistered. Symptoms often appear within hours or days of contact and may continue after the item is removed.
Common sources
Possible sources include jewelry, watch straps, belt buckles, clothing fasteners, keys, coins, mobile phone cases, tools and some occupational materials. The amount of nickel released varies, so appearance alone cannot show whether an item is suitable.
Diagnosis
A healthcare professional may suspect nickel allergy from the location and pattern of the rash. Patch testing can confirm delayed sensitivity to nickel and check for other contact allergens.
Treatment and prevention
Avoid items that release nickel and choose suitable alternatives such as verified nickel-free products when possible. Protective covers or barriers may reduce direct contact but must remain intact. Emollients can support the skin barrier, and a healthcare professional may prescribe a topical corticosteroid for a flare.
Routine dietary nickel restriction is not needed for most people with contact allergy and should not be started without specialist advice. Seek medical care if the rash is severe, infected, persistent or affecting daily activities.
Sources
Reviewed 28 August 2026.