are very very BAD.... please stop using.

If you are on blood pressure drugs, or antibiotics or anything really --you can damage yourself in a tanning bed. There are hundreds of drugs that deposit in the skin, and react with the UV.

Besides tanning beds are now considered causes of skin cancer.

If the spot changes in any way, then you should see a dermatologist. But from your picture, it looks like a pigment change. If it becomes dark inside, blue/black/red or any color changes with irregular borders, it could be melanoma. Remember we are not going to DIAGNOSE you, only point you in the direction you need to go. From what I have seen, I've only given you my experience.

That dry skin is a warning...you are having tissue changes INSIDE also from not eating enough omega-3's in the diet. Your skin is a barometer for that health! Use a moisturizing soap like Dove from now on. It really helps, but it cannot make your skin for you. The omega-3's do that from the inside.
(I have lists of foods and eggs now that have these added on that thread).

Regular doctors are not too great with skin issues. You need a dermatologist for more detailed evaluation. That is your choice to seek it out or not.