Please place a bowl of steaming water next to the cage and refill from time to time. If that is helping, then you may want to get a humidifier.
It is worth noting that new pet shop or breeder piggies tend to suffer more from ringworm (a fungal infection) than mites, which requires very different treatment. As long as you do not have any bald patches (whether fungal or mites - and there are differences), you are NOT dealing with a diagnosable outbreak.
Any home cures will not work and can make things worse. One of my adopted piggies is a surrender because of wrongly applied home treatment on spec; it got so bad that the first vet wanted to pts; the second vet brokered the surrender to a local sanctuary to ensure that the poor guy would get the treatment and knowledgeable care he needed to save his life.
Please only treat once you are sure what you are up against!
If you are in a different country than the UK, please add it to your details. Our default advice is for the UK; we are legally not allowed to diagnose or treat.
https://www.theguineapigforum.co.uk...cation-and-creating-an-avatar-picture.107444/