Rough patches on skin, not itchy?

I have about 5 rough patches on my skin, 1 on my back around my bra strap, 1 on my left side, 1 on my stomach, 1 on my right side and 1 above my by the waistband. They are not perfect circles and do not itch and do not hurt at all. The biggest one is the size of a quarter, the next about the size of a dime and the rest about the size of a pencil eraser. They are not raised that much, just feel rough to the touch and are pinkish, the rest of my body is tan except for those patches. Could it be a pigmentation problem or keratosis or...? I have had a bad sunburn this summer once, and I did tan in the tanning bed (I Haven't in a couple of weeks). Those are the only places the patches are located. Has anybody experienced this before or knows what it could be? Yes, I will be going to a dermatologist, but wanted to see if anyone has ever had or heard of this. Thanks in advance! :)