I've been getting white, dry patches on my knees...?

I've been getting these white patches on my knees ever since I used the pool at a hotel while in arizona during the summer. It started with one quarter sized white patch (no red) on my right knee and it stayed that way until now. The size is the same, but it slowly been starting to spread on my knees and legs as pin sized spots. They aren't itchy and don't seem to be loss of pigmintation. I'm 16 but I doubt its anything hormonal, and more of a fungus sort of thing. I'm naturaly tan so the spots show, but have never used a tanning bed or tanning oil. Anything on what it could be or how to remove it, (most preferably home remedies) would help. Thanks.

[Bhupinder Kaur, MD]

Hello,
For these white spots, pityriasis versicolor is one possibility. Although it is found on the upper trunk but lower legs can also be effected. It is a common skin infection caused by the yeast Malassezia furfur. This skin disease commonly affects adolescents and young adults, especially in warm and humid climates.

Treatment involves topical and oral antifungal medicines.

It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your dermatologist. I sincerely hope that helps. Take care and please do keep me posted on how you are doing.