Hi and welcome
How piggy savvy is your vet and what kind of treatment have you been prescribed? It is impossible for us to comment unless we know more exactly what you have been treating with.
Ivermectin or selamectin drops on the skin are the usual treatment for mange mites (trixacarus caviae); no bathing required (in fact, it can trigger fitting in advanced cases!). Mange mite eggs are generally present in the skin in many guinea pigs and are kept under control by a fully operational immune system. They tend to break out of a piggy is either stressed or ill, or its immune system is still under construction.
Guinea Lynx :: Mange Mites
Mange mites are not visible and burrow their eggs in the skin. If you can see tiny egg cases fixed to the hairs (it looks like somebody has emptied a pepper mill over the piggy), then you are dealing with less harmful hay or fur mites (chirodiscoides). They come with imported US brands hay; we have noticed an increase in cases. Unfortunately the new strain of hay mites can be very difficult to get rid of. Sometimes a mix of ivermectin and lice baths can do the trick, but you need to wait at least 48 hours after each application before you can treat with anything again to allow the active ingredients to be fully absorbed andfo their work.
Guinea Lynx :: Fur Mites
Has your vet checked for a fungal infection, which can look very similar in the early stages but requires different treatment? Ringworm is just the most aggressive and transmissive form, but there are others that can affect the whole body eventually.
Guinea Lynx :: Fungus
Ringworm: Hygiene And Pictures
We may be able to help you better if you please added your country, state/province or UK county to your details as brand names and vet access can vary enormously. We have got members from all over the world. click on your username on the top bar, then go to personal details and scroll down to location.
