Start with the principle
Stainless steel gains corrosion resistance from a chromium-rich passive surface film. Grade and environment matter; stainless does not mean immune to corrosion. Some grades contain nickel, so the alloy name is not proof of nickel-free construction.
A red mark is not a diagnosis
Nickel is a common contact allergen, but pressure and friction can also irritate skin. A material label or photograph cannot establish the cause of a rash. A known allergy is useful information to share when selecting contact components.
Ask about contact, not only colour
Check nose pads, temple tips and exposed metal. For persistent or recurrent rash, avoid the suspected contact and seek assessment. A plastic frame can still contain metal joints or ingredients relevant to an individual reaction.
A worked example
Teaching example: a pressure mark at a nose pad and a recurring itchy patch behind the ear need not have the same cause. A fit review and a skin assessment answer different questions; neither can be replaced by guessing from the frame colour.
CHECK YOUR UNDERSTANDINGIs every red mark from metal glasses a nickel allergy?
No. Pressure, friction and other contact reactions also need consideration.
Sources & verification
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