Editor's note: CNN's Dr. Sanjay Gupta answers medical questions submitted by e-mail on "Your Health" at 2:30 p.m. EDT Saturdays. Questions and answers are posted on CNN.com after the show.

Q: Can ovarian cysts cause infertility? -- Sam in Portland, Oregon

A: Sam, the short answer is: In all likelihood, no.

An ovarian cyst is a fluid-filled sac that forms in an ovary. Such cysts are quite common in women of childbearing age.

There are several different types of cysts. Most cysts are benign and go away on their own in one or two months, and most do not cause any symptoms.

But any cyst can bleed, rupture, cause pain or otherwise cause trouble, and may require treatment with either medication or surgery.

If you have ovarian cysts and are concerned, speak with your doctor about your particular case.

Q: How common are pierced ear infections? -- Erin in Syracuse

A: Infections do happen, Erin. The usual culprits are: piercing with unsterile equipment, inserting unsterile posts, using earrings that are too tight or frequently touching earlobes with dirty hands.

Signs of infection include tenderness, a yellow discharge, redness and swelling.

Most mild infections clear up within a week or two with proper care.

That includes removing the earring three times a day, cleaning both sides of the earlobe with rubbing alcohol and applying antibacterial lotion before putting the earring back in.

You should call your doctor if the earring clasp becomes embedded in the earlobe, the swelling or redness extends beyond the pierced area, you develop a fever of over 100 degrees Fahrenheit or the infection isn't improving after 48 hours of treatment.

I hope that helps.

"Ask Dr. Gupta" is not intended to address specific questions concerning individual cases. CNN does not directly or indirectly practice medicine or provide medical advice, and nothing contained in the responses of CNN through its correspondents is a substitute for medical advice, diagnosis or treatment. Always contact your doctor if you need medical advice or treatment, or have any questions regarding a medical condition.