My Haworthia plant has this strange red spot. I'm not sure what it is - is my plant okay?
Haworthia, Gasteria & Aloe are all closely related. They can all get black spot, which can look red or brown. As a general rule they have good defences systems that protect them from disease. It is not uncommon for them to get one or two black spot and none anywhere else. They rarely have to be treated with any kind of spray. They will grow out of it. If it continues, before you spray improve the air flow around the plant. Make sure it is not jammed up against another plant. Also improve the amount of light it gets. Often making these two changes will stop the black spot. That should be all you need to do for this particular species. If it were a Gasteria it might still require a systemic fungicide spray done twice, two weeks apart. I doubt this plant got many if any more spots.