Face wash that I use everyday suddenly stings and burns?

So I’ve used the same face wash everyday for the past few weeks, and everything has been fine and my sling has reacted well. When I went to wash my face tonight, my face started stinging and burning. I didn’t do anything different. Does anybody have any ideas as to what happened? I use African black soap if it... show more So I’ve used the same face wash everyday for the past few weeks, and everything has been fine and my sling has reacted well. When I went to wash my face tonight, my face started stinging and burning. I didn’t do anything different. Does anybody have any ideas as to what happened? I use African black soap if it means anything.
Thanks!
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