Parasites - Guinea pig

most common are parasites in guinea pigs including fleas, mites, and lice.
Fleas
The cat flea is the most common flea affecting guinea pigs and usually become infested when another pet in the house brings in the fleas from outside. Fleas may also cause hair loss, crusty lesions on the skin, and even anemia.A flea comb can be helpful in finding fleas. Contact your veterinarian for the proper treatment.
Mites
There are two mites that cause skin problems in guinea pigs. They may also be hair loss, thickening of the skin, redness. This mite usually affects the head, shoulders, back, and flanks of the guinea pig, but may spread to the entire animal. Secondary bacterial infections can occur. . The mite is transmitted by direct contact, and can temporarily infest people.
Lice
Lice can cause scratching, redness, papules, and scabs, usually around the head and ears. Some infested animals may not show any signs. Lice are spread through direct contact, and sometimes through the bedding. The lice of guinea pigs do not affect humans.