hello doctor,am 24 yrs old and weigh almost a 130 kilo, tried a million types of diet and exercise, medicines, nothing seems to work, i've got my thyroid tested like 6 times all my reports are normal.... you name the test and i have done that everything seems to be normal. but then i do have this lump kinda thing on my neck,its hard and my neck its all dark(where my chain sits) same's the case under my breast area... i've gone to many doctors but have no clue what to do, everyone keeps telling me to work on my diet and do exercice, which too isn't working.Plz help me proceed.