Hard lump on labia

So this evening I found a pea size (maybe a tiny bit bigger) lump on my labia majora. It's hard, painless and there is no visible head or anything. Skin is usual colour and not swollen. I don't shave so isn't a shaving bump. Just worried as it isn't where your bartholins glands are so panicking a tad (probably for no reason) any thought?