It is difficult to determine the single rarest phobia, given the countless and highly individualized fears people can develop. However, there are many phobias that are considered rare and unusual. Some of the rarest phobias include:

• Optophobia: The fear of opening ones eyes. This fear is incredibly rare and can have a serious impact on an individuals daily life.

• Ablutophobia: The fear of bathing.

• Arachibutyrophobia: The fear of peanut butter sticking to the roof of your mouth.

• Chirophobia: The fear of hands.

• Lachanophobia: The fear of vegetables.

• Omphalophobia: The fear of belly buttons.

• Trypophobia: The fear of closely packed holes.

• Gamophobia: The fear of marriage.

• Chaetophobia: The fear of hair.

While these phobias are rare, they can still have a profound effect on peoples lives. It is important to note that phobias are a type of anxiety disorder and can be treated with professional care.