I just found out that a friend requires a kidney transplant. I've heard that we are all equipped with two kidneys and can live with just one. How do I find out if I can donate a kidney? What's involved in a kidney donation? Thanks!

In a recent question about abnormal hair-growth, the writer mentioned a long history of hydrocortisone use as a means of treating eczema. I too have a long history of severely uncomfortable and troubling eczema. During the worst outbreaks, I have visited several different dermatologists, and all have prescribed topical hydrocortisones, such as Hytone or Topicort, as well as anti-itching pills, such as Atarax. One prescribed Diprolene ointment, which I used for a year, until my next dermatologist dismissively told me it was far too strong and could be damaging.

I would like to know once and for all how damaging the extensive and long-term use of any of these creams is. Please give me one of your straightforward answers; I have been frustrated by the differing views and lack of concern among the dermatologists I have visited. I am tired of being told it is "just eczema." I already use the gentlest cleansing products available, tons of moisturizing cream, rinse all my clothes twice, wear soft fabrics, etc. I am still absolutely tortured by itching, often resorting to scratching at my skin with a hairbrush. The eczema reappears without fail in the same places, even on my face, and is particularly bad after stress periods, when I absolutely cannot control my itching or scratching. Isn't there anyone anywhere doing research on this? Is there anything else I can try? I am not averse to vitamin, holistic, or homeopathic therapies, if there are any. Please help. This is really a very ugly and upsetting problem.

I was wondering what I personally can do (habits, diets, activities) to strengthen my immune system? Thank you!

1) I read the information on your website about knuckle cracking, and I was wondering if it applies to cracking backs and necks. I know that people often have their backs cracked by friends, etc. because it feels good and seems to relieve tension. Also, when my neck feels tight, I often turn it from side to side until it cracks and feels better. I've heard that chiropractors do some version of this, and call it "realignment." Is this safe? Is there a right or a wrong way to crack a back or neck? Is cracking your back/neck actually therapeutic in some way?

2) As a college student, I sometimes spend long hours reading books or looking at computer screens, and often my neck gets stiff. Like many of my joints that get stiff, sometimes I crack my neck, like I would crack my knees or fingers when they feel stiff. I often wind up doing this several times a day.

My question is, could I do irreparable damage to my spinal system if I continue using this method to soothe a stiff neck? Could I wind up a paraplegic if I continue to crack my neck? Leak spinal fluid, etc.?

When is a person with a cold contagious? A couple of friends, who are put off when I keep my distance from their sneezing and coughing, insist one is only contagious a week or so before symptoms appear. In the back of my memory is the idea that one remains contagious until a few days *after* primary symptoms disappear. I'm not usually so concerned about this, but I'm coping with a couple of other annoying health problems and want to try to avoid adding a cold or flu, to boot. I do the usual things news shows recommend — eat well, wash hands frequently. But when should one avoid others who have colds, or when should one stay isolated at home when one has a cold (or flu)?