The Pointless host agreed to have the check-up to discuss the dangers of not getting a regular examination.
However, eagle-eyed This Morning viewers noticed that the show's resident doctor did not wear any gloves during the examination.
Fans took to social media, with one tweeting: "Why is the Doctor guy not wearing any gloves while he's feeling Alexanders balls for the cancer #ThisMorning."
Another wrote: "#thismorning how come dr chris never wore gloves yuk."
The Pointless star agreed to get the check up live on This Morning
Alexander was praised for his efforts in raising awareness of testicular cancer
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Before his check-up, Alexander was interviewed with Diversity star, Ashley Banjo, as they are teaming up to find stars to recreate The Full Monty in order to raise awareness of cancer in men.
This Morning viewers were quick to praise Alexander for raising such important issues as well as showing how easy it is to receive a check-up.
One fan said: "Well done to Alex Armstrong for having a testicular cancer check live on #ThisMorning & for pushing guys to get themselves checked too!!"
Alexander appeared with Ashley Banjo who are teaming up to raise awareness of cancer in men
Dr Chris is the resident doctor on This Morning
Another tweeted: "@XanderArmstrong well done on #ThisMorning a great advocate for raising awareness of #MensHealth."
Express.co.uk has contacted ITV asking for comment.
This Morning airs weekdays on ITV from 10:30am.