It is done in about three sessions at three to four week intervals. The under-eye fills over four to eight weeks, because the material does not create volume itself but prompts the skin to make collagen, which takes time. Thin skin thickens gradually as sessions add up.

It does not fill immediately but appears gradually over four to eight weeks, because the skin makes its own collagen to fill in. In exchange there is less risk of looking lumpy than with filler that fills at once, and under the eye — where skin is thin — that difference matters especially.

Under-eye filler fills at once, but the area is thin so it can clump or show through with a bluish tint. Collaum works by prompting collagen and fills gradually, so that risk is lower. In exchange you wait weeks to see the result, and several sessions are needed to reach the level you want.