Physical appearance of bed bug eggs. What do bed bug eggs look like? They are very small and white to pearl-white in color. They appear to be shaped like a barrel and are about the size of a pinhead or a grain of salt. They are covered with a sticky substance, which adheres to almost any surface the female places them on.
Although you're more likely to see shells of nymphs, you may come across some bed bug egg casings. Bed bug eggs are only about 1/16 inches in length, are oval-shaped, are white, and may resemble other insect egg sacs. If you're unsure of what you are seeing, a quick online search can be helpful.
Shells or Castings: Are there shells (shed skins) / castings? As the bed bug develops, it sheds the skin which looks like the bug. Tiny white eggs (like rice) along the edge of the mattress and seems are a good indication of an infestation.
You will find various sizes of bed bug skins depending on the stage of life: Bed bug egg - 1 mm. First-stage instar nymph - 1.5 mm. Second-stage instar nymph - 2 mm. Third-stage instar nymph - 2.5 mm. Fourth-stage instar nymph - 3 mm. Fifth-stage instar nymph - 4.5 mm. HOW OFTEN DO BED BUGS SHED?
These are some smaller bed bug shells These are what bed bug eggs look like that have hatched. New eggs are not transparent, white, and sticky and look like rice. This is what bed bug poop looks like and is dried blood that was excreted.
This FAQ has close images of bed bug shed skins from Lou Sorkin: What do bed bug shed skins look like? This FAQ has images comparing bed bug cast skins to those of German cockroach, dermestid beetle larvae, and a carpet beetle, as well as comparing bed bug cast skins from nymphs of various stages: What do bed bug cast skins look like?