confirming this is sunburn

Zone lake havasu city, az | Anonymous added on October 30, 2019 | Answered

Greetings cacti experts I have noticed a few of my cacti to have these white spots. They are hard with nothing inside. There are no insects. This is an established 16 year old but does get full sun. We live in Arizona climate zone 10A see photos attached thank you jan S

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Certified GKH Gardening Expert
Answered on November 2, 2019

I would say it was a fungal infection rather than sunburn. Here is more information on combatting fungal lesions on cacti:

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