The Apple Watch - Apple's first wearable - may have already started receiving criticism online from some early buyers.

Some people claimed that they experienced skin irritation that might have been caused by materials used in the Apple Watch. Other users claimed that they got a rash where the band sits on their wrist.

Images of a wrist with a bad rash first appeared on the Italian website Ispazio. Another user reportedly got rashes from using the Apple Sport watch, based on a post on Reddit. Both negative reviews were published on Tech Firstpost.

Apple has devoted an entire support page to this problem, and stated that the Watch has been tested a number of times.

The company has consulted with board-certified dermatologists to ensure that the materials used on the Watch will not cause any adverse reactions to the user. Apple then recommended that users who might have encountered a problem should wear the Watch neither too tightly nor loosely to allow the device to have some breathing room.

"A small number of people will experience reactions to certain materials. This can be due to allergies, environmental factors, extended exposure to irritants like soap or sweat, and other causes," Apple stated.

The company then advised these users not to use the Watch if they encountered any problems, or to consult a physician before wearing it again.