If a black spot has been there that long, has gotten larger, and has not gone away with a shed, then I'd be taking him to an experienced reptile vet for a simple, inexpensive skin scraping test, as bearded dragons do get skin cancer, and a black spot that has been present for months and months, through a shed, and that has grown sounds suspect. I don't think it's anything that an antibiotic ointment or raw honey is going to help at this point, if it was it would not have been present for months and months, nor would it grow larger, even through a shed. That's an indication that it's not just a superficial wound, but rather some kind of growth. It may be benign and harmless, but it may also be malignant and need to be removed. If that's the case, the longer you wait the more complicated it's going to be to treat, and since it's already been present for quite a while I wouldn't wait any longer. Just like we get dark pigmentations when out in the sun, or moles/birthmarks we have change and get larger when in the sun, which can be dangerous, so can reptiles. A simple Skin-Scraping test will tell you if it's something serious or nothing to worry about, is non-invasive, and shouldn't cost much at all to have done, so I'd suggest calling your closest experienced reptile vet and telling them you need to make an appointment to have your beardie have a Skin-Scraping test done. Even an "exotics" vet can do a Skin-Scraping and send it out for testing. If they look at it and tell you to "wait and see", be sure to tell them it's already been there for months and months, has lasted through a shed, and that you insist upon having the skin scraping test done immediately. Then if it comes back as being something serious, you'll definitely need to find a certified reptile vet to determine a treatment course.