Courtesy of Jeff Donald, another Community regular:
You may have contact dermatitis caused by an allergic reaction or sensitivity to nickel in the metal cases or bands. Nickel is used in the hardening process of stainless steel, aluminum and sapphire crystal.
>>In fact, it is estimated that more than 18 percent of people in North America are allergic to nickel, including 11 million children in the U.S.<<
https://www.aad.org/public/diseases/eczema/insider/nickel-allergy
https://www.mayoclinic.org/diseases-conditions/nickel-allergy/symptoms-causes/syc-20351529
It happens often enough that multiple doctors have created YouTube videos about the issue. I’ve linked below to a short 30 second video by a physician that explains the issue.
https://youtube.com/shorts/NqN8ZkJKwGo?si=-q2YU_CXwqJUxz7B
Please make an appointment with your primary care physician and get a diagnosis of your condition. Your doctor may refer you to an allergist or dermatologist to confirm the diagnosis.