hi the bottom of my little barrel cactus is tu…

hi the bottom of my little barrel cactus is turning yellow brown? it isnt mushy but i think it might be slightly softer. do you know how i can fix this please?

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It doesn’t look to me like anything is wrong. i’m sure it’s just corking — which is a natural process that cacti go through as they age. the oldest part of the cactus (i.e. the bottom) develops a brownish, corky layer… which is basically just the cacti version of a tree trunk. your boy is getting old! be proud of him!!