Cactus Is Growing New Arms But It’s In A Cluster And Now The New Spikes Are Damaging Itself, releasing White Liquid.

Question

Cactus damaging itself.

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Answer 1

Try repotting it into a well-draining container about 1 or 2 inches larger in diameter than the one you have. It looks crowded and that may be its original store container. If the damaged parts darken you can carefully cut them out.

https://www.gardeningknowhow.com/ornamental/cacti-succulents/euphorbia/growing-euphorbia-plants.htm