<s>[INST] My husband mentioned to me that I have two black spots on my back...one about the size of a quarter just above my butt crack, and one a little higher and about the size of a dime. They do not hurt, itch , or anything like that. In fact, I was completely unaware of them before he mentioned them. Should I be alarmed? Thank you. [/INST] Hi, The site mentioned by you is preferred site for Mongolian spots, which is absolutely benign condition. Other possibility is of post inflammatory hyperpigmentation, if you could recall some trauma or infection of skin in the past. It may be melanocyte nevi. None of these conditions seems to be problematic. Whenever you feel free, take opinion of a dermatologist so that you get proper name of the lesions. Regards </s>