The most common parasite that is found in humans is the Hookworm parasite.
Most people who do get infected with worms or parasites get infected with Hookworm which is the most common parasite for humans.
Other common parasites that are found in humans are the parasites such as Giardia intestinalis, Entamoeba histolytica, Cyclospora cayetanenensis, and Cryptosporidium spp which are intestinal parasites.
The other common parasites found in humans are Toxoplasma gondii, Entamoeba histolytica, Flatworm, Tapeworm, Roundworm and the Scabies Mite.
Other parasites are also common but those are the most common parasites that are found in humans.
Parasites can also enter your skin and come out through your skin such as through your feet.