Hi. I have an almost 1yr old neutered male Swiss pig. He is a big boy at 1400g and seems happy and healthy living with his 2 girls. I will attach photos but basically he has white stuff on his back in one area only. I would say it's dandruff but it's a bit sticky for that. The actual skin looks healthy and he isn't scratching. He has been treated with ivermectin about 3 weeks ago as a precaution. The girls he lives witj don't show any signs of anything similar. What could it be? I have ordered a lice shampoo and will treat again with ivermectin when it's due. What could it be?