I don't understand what you mean by 'it won't be in line' (I'm imagining three lobe piercings, which I think is pretty common and looks alright?). Ink the dot on and see if you like it. And if you do want it done, then just go for it. If you then decide against it, just take it out and let it heal over.
I hesitated for ages over my third love piercing, finally went for it and I love it. It's not completely symmetrically spaced with the other two as it had to be below the cartilage but once I've got earrings in all three holes you can't tell. It did take longer to heal than my first two though, possibly because it gets knocked a bit more.
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The only problem I had with my third piercing was that it took ages to heal, and I don't know why :/ by the way, a professional isn't necessary - both of my second piercings, as well as my third one, were done by friends with a sewing needle. I think that you just need to be certain that they're doing it cleanly (we used antibacterial solution) because getting an infection is the most worrying part
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