Random red blotches on skin

Ally

I have four of these small red blotches just under my ribcage and have had them for a while (maybe a few months?) They don't itch or anything, I hardly notice they're there, my skin generally is quite sensitive and can rash easily but these blotches haven't gone away. Can anyone suggest what they could be? I will make a drs appointment to get them checked out but any advice in the meantime would be great.