How did I get an ad on my lock screen?

[Android Central Question]

I haven't downloaded any new apps but suddenly I'm getting an ad to "boost my ram" on my lock screen. It brought up an ad for lyft but I don't have an so with them. How can I find the existing ap that started pushing lockscreen ads on me?

 

[belodion]

*Try disabling them one by one. They can always be re-enabled afterwards if not the cause of the trouble.