My cactus is turning black and pale
Hello,
I inherited a cactus that's over 25 years old from my deceased mother and I am watering it lightly once a week. Today I noticed discoloration on various parts of the plant. Can anyone please provide some insight into what's wrong with the plant and how to save it?
Thanks
I inherited a cactus that's over 25 years old from my deceased mother and I am watering it lightly once a week. Today I noticed discoloration on various parts of the plant. Can anyone please provide some insight into what's wrong with the plant and how to save it?
Thanks

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Unless the pic was taken at night, it does look to be in a rather dark corner which won't help. Can't see the pot or tell what the growing medium is.
It shouldn't require a weekly watering either so as @B3 says, that could be the problem.