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I noticed this odd looking browning patch on one of my cacti shortly after I had purchased it. I’m not sure if it’s part of a natural process or if it’s a sign of an unhealthy cactus. Could you shed any light on this? I’ve felt the spot with my finger, and it has a different texture to the rest of the cactus, and it seems almost like a callus of some kind (can Cacti get calluses?). The spot is tougher and more rigid than the rest of the cactus, so I’m just a little concerned. The woman at the store advised me to water it every 2 weeks and give it all purpose fertilizer ever 7-8 weeks, but neglected to tell me the last time either of these had been done while the cactus was in the store, though I promptly watered the cactus when I discovered the soil to be dry as a bone, so I’m thinking that lack of fertilizer may be the cause.

Am I right or entirely missing the mark?

I hope to hear from you soon.

Sincerely,
Andrew

Andrew,
It looks like your plant is “barking” over an old infection or injury. This is normal and is the way cactus age and deal with this sort of thing. But do watch it for getting soft as that means the infection is winning and the plant is rotting. But it looks like yours is doing fine.
Take care,
Hap

    
    
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