By continuing to use the website or clicking Accept you consent to our cookies and personal data policy and confirm that you are at least 18 year old. For details please see Privacy Policy and Terms
Could use some more photos.
It looks like a chemical burn from spillage - if it's isolated it might be.
You can do a few things - but don't overwater or feed. If you are concerned pull that leaf off. I'm not concerned though if the rest of the plant is doing good.
Show us some more?