masturbating more often, now i’m sore

Hey, i’ve been masturbating a lot more often lately and i use a back massager. when the batteries start dying i tend to press it against my clit harder. i’ve been so sore from it and very very itchy! Is this bad? I really don’t want to have to see a doctor for this because i’m sure it’ll go away. i guess i’m just wandering if any of y’all have had this problem?

the back massager is made out of a hard plastic

edit: i think it might be the baby oil that i used as a lube the night before. i’ve used it before but the itchiness is so bad right now, it’s the only thing i can think of that could have caused it