TLC’s Tionne Watkins is taking a step back from the stage as she recovers from a medical emergency. The singer, who performs under the stage name T-Boz, is currently on the road with fellow TLC member Rozonda “Chilli” Thomas as part of the “It’s Iconic” tour, alongside Salt-N-Pepa and En Vogue. Recent videos show Thomas, 55, taking the stage solo, later revealing that Watkins, 56, was absent from the performance due to a sickle cell flare-up, according to USA Today. Thomas addressed the crowd during a recent show, saying, “I want to ask each and every one of you to help me hold her down tonight. Thank you in advance for your support and…