Suggest Remedy For Blisters On Penis

i have a question about blisters on the penis, i am 15 and received oral sex from 1 girl multiple times who was a virgin and I'm pretty sure she didn't have herpes, can you get blisters on the penis from over masturbation? and if so how can i get rid of them? its been 4 days since i last masturbated and the situation still didn't change, i also have a history of eczema on my arms and legs