Hi - I can't say precisely the exact reason of this patches at this moment. I advice u to go for ELIZA test by which u can get right reasons. As diet is concerned, U can add more citrus fruits like lemon, oranges,musambi, sour CURD,yogurts, tofu,flaxseed etc. take more soluble fibres ,greens like spinach green vegetables, colors ful vegetables etc. all u need vitamin C, E, ,Water soluble vitamins.

Hi, hope you are well. I can see from your details that you are over weight. In a few cases the darkness around the neck and underarms are due to excess fat deposition in the body. But a general physician would be the right person to consult. Also see a dietitian for your diet or you can ping me for a personalized diet appointment.