Why Did I Get an Indentation on Forehead After Botox?

You may be noticing an indentation since your brow is weak and immobile from the Botox. When your forehead is smooth, contour irregularities may be more noticeable. Botox injections do not lead to indentations.

If the area is bothersome, and you're not satisfied by the explanation of your doctor, then certainly get a second opinion from a board-certified, experienced Botox injector.

I hope this is helpful for you.

This is highly unlikely to be permanent and will likely resolve when the botulinum toxin effect dissapates between 3-5 months.

Unfortunately your description does not provide enough information to offer an intelligent guess regarding what is going on. The most common type of issue is a change in how the forehead muscles contract following an unbalanced BOTOX treatment causing new wrinkling in the forehead due to muscle recruitment.

Was there a vein that has disappeared after Botox, whether coincidentally, or related to trauma, which can happen with any injection and any injector? Is this a sleep crease from lying on the pillow on your side and seeing a diagonal line? See your doctor to see what they think. It probably is temporary.

The dent in your forehead is not likely to be due to the Botox itself but rather due to the effect of Botox on the underlying muscles.  Botox paralyzes the muscle, smoothing it out which may uncover underlying irregularities of the bone of the forehead.  It should lessen as the Botox wears off.