Some Apple Watch Series 12 and Ultra 4 owners have reported skin irritation, including burning and redness around the sensor area, according to user accounts collected by MacRumors.
Apple’s support guidance on wearing Apple Watch notes that some models contain nickel (below EU REACH limits) and that the case and some bands contain trace acrylates from adhesives, with the parts containing acrylates designed not to touch the skin directly. The company says it conducted thousands of material tests and consulted board-certified dermatologists.
Apple states that skin reactions can result from wearing the band too tightly or too loosely, or from irritants such as soap and sweat. It recommends wearing the watch above the wrist bone, ensuring a snug but comfortable fit, and keeping the area clean. Some users found irritation resolved after an adjustment period or with cleaning; others have returned their devices.
Wrist irritation complaints have occurred with earlier Apple Watch models. The new Series 12 and Ultra 4 feature larger sensors and more frequent heart rate readings, though it is unclear whether these design changes contribute to the issue. Apple advises anyone experiencing irritation to consult a physician before wearing the watch again.