Miami tweeted out a video showing Winslow bleeding:
The Palm Beach Post's Anthony Chiang tweeted that stitches were likely.
Winslow was largely healthy during a productive rookie season in 2015-16, but things took a turn when his 2016-17 campaign was cut short due to season-ending shoulder surgery after just 18 appearances.
Bad luck struck again in December when he was diagnosed with a left knee injury that forced him to miss 14 games.
When healthy, the 2015 lottery pick averaged 7.8 points, 5.4 rebounds and 2.2 steals as a hybrid forward for head coach Erik Spoelstra. He averaged 10 points and 6.7 rebounds during the first three games of the series.
If the injury lingers, Josh Richardson should continue to eat up minutes on the wing with Kelly Olynyk and James Johnson locked in as the club's go-to options at power forward.