Hello Dr. My mother 56, recovering from Covid-19. This is her 20th day. For the past two days. she noticed a significant drop in OXIMETER reading from 99 to 94 and come back to 98-99 again. Her oxy level during the covid period was 98-99 always. Whenever she inhaled steam or do some activity her oxygen drop reached 94. Is it a sign of worry? Are we missing something? She is on the steroid for the past 12 days. Also, her reading in both hands are different. In left she always has 3% less compare to right hand.