Using hair removal cream on anus while fasting

using hair removal cream on anus nullify fasting?

I have hair around my anus and i do not feel hygienic if i don’t remove it . I just understood this ramandan that putting cream on anus could nullify the fast , I remember that previous Ramadans i was using and puting this hair removal cream on my anus to remove hair. i do not remember how many ramadan i have done this. I have alot of doubts and don’t know what to do. please help me clerify this matter .Now whats the ruiling about it are my fasts nullified or my fasts are valid . If nullified how can i make it.