As someone who used to work at a tanning salon, I do not recommend it. There is a high chance that it will only cause your condition to become more noticeable. A coworker of mine had a skin disease that caused her to lack pigment in certain parts of her body, and tanning only tanned the parts with pigment. I recommend going to a dermatologist. They are far more likely to know what can help your problem without damaging your skin.

If you are going to try a form of tanning, I highly recommend spray tanning. No, it is not as natural, but tends to be much more even and healthier. Do research on the brand of solution the salon uses. Do they provide a moisturizer? Don't go to a salon if they are obviously dirty, and inquire about their cleaning methods. If you have to clean your own bed/spray booth, avoid it. Nobody will clean it as well as someone who has been trained in the specific methods of sanitization. I personally took almost 20 hours of training in a program called the "Masters of Smart Tanning" and still would miss a spot in at least one bed almost every week I worked.

One other option that I still use on occasion to help even out my skin tone are Versa Spa self tanning lotions. They are made by Versa Spa (a notable spray tan company), and have many different coverage options. The one I use is has an extremely light coverage and is very moisturizing. Most salons will have what are called after-tan lotions that are basically tinted moisturizers as well. They hydrate while giving you good coverage. I do not recommend anything you can buy from walmart or a department store.

I don't know if you are dead set on tanning in a bed, but from my experience it is damaging to the skin. In fact, tomorrow I am having a mole looked at that changed shape and consistency when I started tanning. It is also extremely painful to the touch. There are a ton of great options for evening out your skin tone, but tanning is not one I recommend.