My bunny has a rapidly expanding skin issue. Could it be mites?

This is most likely Scabies (a mite infestation), this can become much more severe than that, i recommend taking him to the vet ASAP, he will need an injection of ivermectin (3 times one week apart), this should resolve the problem within 2-4 weeks.

Binky may be suffering from mites, as may your other rabbit. Patchy fur loss with flaking along the rabbit's back is typical for the mite Cheyletiella parasitovorax, Your veterinarian may examine a sticky tape preparation or skin scraping under the microscope for the presence of mites, however, might sometimes not find any, even though they are present on the rabbit. Mites are usually eradicated easily. Classic treatment is with injectable or oral ivermectin, or a selamectin spot on given in treatments two weeks apart. As mites live in the environment of your rabbit, it is essential to thoroughly clean your rabbit's cage and disinfect areas after each treatment to control reinfestation, since fur and dander in the environment may contain mite eggs. You will need to treat all rabits in your household.

Cheyletiela mites are often difficult to see with the naked eye, they can be treated either with ivermectin spot ons or Revolution spot ons, both are prescription medications that you will need to get from your vet.

It's very difficult to check for mites, when such an itching problem occurs the first thing that should be done is treating her for a possible mite infestation, i would recommend to take her to the vet ASAP, the treatment is usually by injection and it requires 3 sets of treatment 1 week apart.

Rabbits can be treated for mites with ivermectin or revolution. I would however recommend taking Olaf to another vet to get the proper dosing. You do need to clean the cage every day for a least 1-2 weeks to help prevent re contamination from the mites. I hope that helps

Sometimes mites can be transmitted by commercial store-bought food or hay. You will need to take your rabbit to a veterinarian for an exam and proper diagnosis. The vet can then inject your rabbit with an acaricide that will get rid of the mites. You will also have to clean out thee cage thoroughly, wash it with bleach and rinse it well, and wash all toys and food and water containers in very hot water. Throw away the food and hay you have and buy new food with a long expiration date.

It is either ringworm (fungus) or some type of parasite (like mites). Just because the others don't have mites does not mean it is not mites. Some mites are not contagious. I really have no idea what diseases are prevalent in rabbits in Malayasia. You can certainly use the topical medicine from your other rabbit to see if it helps. If it doesn't then you will have to try something else.