Hi. I need help about piercings.

I pierced an earhole at a mall using the gun about 3 and half months ago, and one of them was pierced right below the first earhole i had when i was 9,but i stopped wearing earings when i was ten( I'm seventeen). The problem is that both holes have joined into one about 2 months ago and there was a pretty large lump behind my ears, i so i took the studded earing off. When I took it off, there was a lot of pus and some brown thing. It also smelled awful.. now my lump is gone and i want to continue wearing the earing but im afraid there would be an infection again. What should i do ?

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