Sudden skin darkening ( progressive) : (

Face looks abnormal dark like dull , sick n abnormal darkness....i 'm feeling helpless & totally Low as just before my marriage I m seeing drastic change in complexion due to diabetes insipidus, dehydration or new hormonal medicine desmopresin. I'm just taking one medicine desmopresin and it's progressive abnormal darkening. Initially, after taking desmopresin my face was red for 15 20 days then started to turn in dark form... Also got pigmentation marks on fingers n stomach ACTH is 13 Cortisol 18 Vitamin B12 350 Vitamin D 16 HB 11.4 Trasferrin bit low 184 One problem which I always notice White blood cells are always on high side Sometimes 11000, 12000 0r 10500 Medical history Severe allergic reactions In 2019, I face major allergic reaction which is treated with high steroids Asthma allergic reaction too Now, don't know about skin part :(