Demodex Mites (Commonly Associated with Sarcoptic Mange and Acariasis Skin Disorder) Side effects: redness around eyes, nose and ears Some of the time hamsters get bugs (minuscule parasites), which can live in their hair follicles. Your hamster might start scouring their body against their pen or their toys. Whenever left untreated bugs might cause sicknesses, for example, mange or acariasis skin issue. To ensure your hamster has parasites you will need to brush their hide and look nearer with an amplifying glass. To treat parasites you will need to altogether clean your hamster's enclosure with against bug shower and you will need to take your hamster to the vet for treatment.