About 6 months ago I noticed a small lump right below my left breast. It felt like one of those gross hard pimples that sit just below the skin and was quite sore for a few days. After a couple of days it got a bit smaller and once the soreness disappeared I forgot about it. It's starting to bug me again as it's starting to get a bit sore from the bottom of my bra rubbing against it.
Is this worth checking out or can I expect the soreness to disappear like last time? Thank in advance