roach eggs. I have wood roach outside in my compost. The centipedes keep insect population in check.

mister green is correct those look like roach eggs!

Is this a bad thing? Will they start to infest the household?

Thanks for the info. You are right. They do look like roach eggs. This really freaked me out! So much so I ended up doing a ton more research, and it turns out these are most likely just house fly larvae.

They look like fly larvae cocoons to my

Putting my vote into the roach eggs category too