Hi, It is difficult to determine whether a pink mark on your thigh is a sign of a new mole formation without a physical examination. Moles are usually dark in color, although they can vary in size, shape, and color. If the mark is new and does not resemble any moles you currently have on your body, it is important to have it checked by a healthcare professional to rule out any potential skin conditions. A pink mark on the skin can be caused by a variety of factors, including injury, infection, inflammation, or a skin condition. An ache in the area around the mark may also indicate an underlying condition, such as an infection or inflammation. Therefore, it is recommended to see a dermatologist or your primary care physician to get a proper diagnosis. During your appointment, your healthcare provider will examine the mark on your skin, take a medical history, and ask you questions about your symptoms. Depending on their findings, they may recommend further testing or a biopsy to determine the cause of the mark. They may also suggest treatment options such as medication or removal of the mark, depending on the underlying cause. In general, it is important to monitor any changes in your skin and report them to your healthcare provider as soon as possible, especially if you notice any new moles, changes in existing moles, or any other skin abnormalities. Early detection and treatment of skin conditions can help prevent more serious health issues down the line. Take care. Hope I have answered your question. Let me know if I can assist you further. Regards, Dr. Priyanka, General & Family Physician