There are reports that sales of the new watch have plunged by 90 per cent since the opening week of sales. Source: AFP

“Not worn my Apple watch today, yet there seems to be some sort of burn anyone else got this too?”, said Twitter user Dinalli, who described herself as an iOS app developer.

“My Apple watch has burnt a hole in my wrist!!”, said another Twitter user, Andrew Terry.

So far the claims seem extremely few in number considering the millions of people wearing the device.

Apple isn’t commenting on the claim, but it does warn on its support site that some people might experience reactions to certain materials in the watch. This is despite thousands of material composition tests and more than a thousand prototypes worn for trial studies, the site says.

Some people might experience reactions “due to allergies, environmental factors, extended exposure to irritants like soap or sweat, and other causes”, the website says.

It warns users to be aware that the watch and some of its bands contain nickel and methacrylates.

“Apple Watch, the space grey Apple Watch Sport, the stainless steel portions of some Apple Watch bands, and the magnets in the watch and bands contain some nickel. However, they all fall below the strict nickel restrictions set by European REACH regulation,” the site says.

“The Apple Watch case, the Milanese Loop, the Modern Buckle, and the Leather Loop contain trace amounts of methacrylates from adhesives.”

Certainly Apple wouldn’t want to travel down the path of Fitbit, which in 2014 was forced to recall 1 million of its wireless wristband fitness trackers after consumers complained about rashes and burn marks after wearing the Fitbit Force.

One user on Twitter has suggested a sensor could be overheating on the back of Apple Watch.

But it could simply be a case of the same problems that some analog watch wearers have experienced for decades.

They could be wearing the watch too tightly on the skin, or it could be a skin reaction from sweating after exercise.

Of more concern to Apple will be reports that sales of the new watch have plunged by 90 per cent since the opening week of sales.

Research firm Slice Intelligence claims Apple has been selling fewer than 20,000 watches daily in the US, around a tenth the number it sold daily after its launched in April.

Slice Intelligence also found that Apple Watch hasn’t been cannibalising sales of the most popular fitness device company, Fitbit.

Based on its research, it found that only 4.8 per cent of those he bought a Fitbit also had purchased an Apple Watch.

Not every analyst agrees with Slice Intelligence however. Creative Strategies’ principle analyst Ben Bajarin said Slice’s findings should be taken with a “grain of salt”.

It failed to consider global sales, and the ebbs and flows of sales in the US market. He estimated there was just under 5 million Apple Watch sales in the June quarter.

On the other hand, Apple will be buoyed by more reports of the success of the iPhone 6 and 6 Plus.

Today the website AppleInsider.com reports that during the June quarter, iPhone 6 and 6 Plus sales kept the iPhone the top selling smartphone brands with all four major US carriers, with a market share of almost 50 per cent.

Analyst firm Canaccord Genuity quoted in the report said that given only 20 per cent of the iPhone installed base had upgraded to the 6 or 6 Plus, Apple can continue to expect strong replacement sales going forward.

AppleInsider said the iPhone’s US market share had remained fairly constant despite the launch of high-profile Android rivals from the likes of Samsung HTC and LG.