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Why does fake gold turn your skin green? Read about the chemical reactions with jewelry that make your skin turn green.

Skin irritants could be a chemical, a surface or a substance to which you're allergic. See 10 common skin irritants you should you avoid.

Bruises -- badge of honor or lasting evidence that you're a klutz? Take a look at what causes bruises and treatment options for brusies.

Does a petroleum jelly moisturizer work? And can it be as effective as expensive moisturizers? Take a look at petroleum jelly moisturizer.

Sigmund Freud was a psychologist who contributed to our knowledge of psychology . Visit HowStuffWorks to learn all about Sigmund Freud.

Habit is a term used in the study and practice of psychology. Visit HowStuffWorks to learn all about the term habit.

Memory is a term used in the study and practice of psychology. Visit HowStuffWorks to learn all about the term memory.

Mental illness is a term used in the study and practice of psychology. Visit HowStuffWorks to learn all about the term mental illness.

Mind is a term used in the study and practice of psychology. Visit HowStuffWorks to learn all about the term mind.

Spray tanning can be a healthier option for deepening your skin color. See how spray tanning works and learn if spray tanning is safe.