Second advice: protect your skin
The idea here is to use something to protect your skin from contact with the Nickel containing objects.
Traditionally, this has been done with gloves or barrier creams to protect one's hands. However, wearing gloves at all times is not the most convenient thing to do. And traditional barrier creams tend to be simultaneously not very efficient, very heavy and "greasy" (they typically create a plastic like layer on the skin), and therefore not convenient at all; such traditional barrier creams also are non specific, meaning that they also block normal skin breathing and contact with the air, which is necessary for skin to remain healthy.
This is why a new solution has recently been developed by Skintifique. In short, the company scientists developed a novel approach, designated as CapturifiqueTM, that can be included into moisturizing creams and lotions and that selectively prevents Nickel and other allergens from penetrating into the skin; this thereby effectively protects the skin from triggering an allergic reaction and rash. Skintifique products that contain this CapturifiqueTM technology and are specifically designed for Nickel allergy skin include the Protective Cream HPS and the Moisturizing Lotion HP.
Third advice: efficiently manage the symptoms
Since it is very difficult to avoid exposure to Nickel, you may also need to deal with the symptoms of Nickel allergy once you skin has been exposed.
To that end, you should, of course, preserve your skin from further contact with Nickel, using one of the approaches above.
And you should also extensively moisturise your skin: according to a study published by Mayo Clinic: “your skin has a natural barrier that is disrupted when it reacts to Nickel and other allergens. Using emollient creams or lotion could reduce your need for topical corticosteroids”.
And of course, the skincare products you use should have very clean compositions, i.e., be free from the many ingredients that are known to be risky for one's skin, such as essential oils, formaldehyde releasers, common allergens etc. Unfortunately, such risky ingredients are found in most skincare available in the market...