Booger like things appearing on my walls

Can someone help me dealing with this? They're constantly growing on my walls whether I clean them or not. They're very solid.

I live in Yerevan, Armenia. The place where these creatures are, is my apartment which was renovated before I moved here. They've been more than just these two, I removed them but they're still growing. The size is similar to booger size, some of them might be bigger, so 3cm+