Can treating bunny lines alone cause the forehead to drop making eyes appear smaller?

Absolutely not! The nose area has no connection with your forehead so you do not have to worry about it.
Good luck.

Thank you for your question CHRIS IS IL. I understand your concern. Botox is a purified protein used to address wrinkles associated with facial expression. When injected into the skin Botox will relax the muscles and smoothen out the overlying wrinkles. The most common areas of treatment are in the upper face. These include the horizontal lines seen on the upper forehead when one raises the brows, the vertical lines seen between the brows when one frowns (frown lines), and the crow's feet seen around the eyes when one smiles.
It is difficult to make an assessment in the absence of consistent photographs before and after in the same lighting and angles for comparison. However, I hope the information provided here is useful.The nasalis muscle on the bridge of the nose is responsible for the bunny lines that are sometimes seen there when one frowns or smiles. Usually 2-4 units of Botox are used per side for this area. When patients present with concerns about specific wrinkles in the upper face such as the frown lines, I always assess and usually treat the other wrinkles in the upper face including the horizontal forehead wrinkles and crow’s feet. The reason is to maintain a harmonious and natural balance to the appearance of the upper face. The muscles in the glabella which are responsible for the formation of the frown lines serve to pull down on the inner brows when a person frowns. Similarly, the muscles around the eyes which are responsible for the formation of the crow’s feet seen when smiling (orbicularis oculi) are also responsible for pulling down on the brows, but in this case the outer brows. On the other hand, the muscle in the upper forehead which is responsible for the formation of the horizontal forehead wrinkles when a person raises the brows (frontalis) serves to pull the brows upward. If one of these muscles is relaxed with Botox and the others are not, the other muscles will still be active. This will lead to an unbalanced and unnatural appearance of the upper face where the brow can be elevated, depressed, or uneven in shape or position. Therefore, I recommend that my patients take a global approach to the upper face when receiving Botox treatments and treat all three of these areas. Sometimes bunny lines on the bridge of the nose are also treated.A phenomenon seen with Botox is called muscle recruitment and compensation. When a muscle has been relaxed with Botox, sometimes other muscles or a different part of the same muscle are recruited and contract when one attempts to make the facial expression. This serves to compensate for the inability of the primary muscle to contract. Sometimes a bulge can appear in a muscle that was untreated or a part of a muscle that was not treated. A common example is the bunny lines (caused by contraction of the nasalis muscle) that are seen on the sides of the upper nose after treatment with Botox in the glabella or for the crow's feet. Since the muscles in the treated area are relaxed, the nasalis muscle contracts in an attempt to compensate for this loss when one frowns or smiles. In such a situation, the bunny lines can be treated with a small amount of Botox (2-4 units per side). In the upper face, sometimes a portion of the frontalis muscle in the upper forehead which was previously not active becomes active once the muscle is relaxed with Botox. In these case, new wrinkles may be seen, often near the hairline. This can be treated with a small dose of Botox in that area. This can also be seen in the lower face when not enough product has been used in an area such as the chin. Sometimes another part of the muscle begins to contract in order to compensate for the relaxation of the muscle from Botox. This can also be treated with a small dose of Botox in that area. Compensatory recruitment can also occur when the platysma muscle in the neck contracts after muscles in the lower face have been relaxed with Botox. Similarly, this muscle can be relaxed with Botox as well. For my patients, I usually use approximately 10 units per band. If placed properly it does not affect other muscles. Relaxing the platysma muscle may also lead to an improvement of jowls and jawline definition. When such recruitment occurs, I recommend prophylactic (preventive) treatment of the recruited muscles at the next treatment.
If I had a patient with the concern described here I would want to look at before and after photographs. In the absence of such photographs I would suspect that there is some compensatory recruitment going on as described above and taking a global approach by treating other muscles in the area may be of benefit.With any injection, there are risks such as pain, bleeding, bruising, redness, swelling, tenderness, and infection. We take special precautions to minimize these risks such as using a painless technique. We also treat bruises with a laser as early as the next day. Bruises usually resolve within two weeks if untreated. After a laser treatment bruises usually resolve in 1-3 days, but may still take two weeks for full resolution. In addition to these risks, with Botox there is also a risk that the product spreads or diffuses to nearby structures. Spread to nearby muscles can lead to side effects such as the temporary appearance of droopy eyelids or a temporary asymmetric smile.

After a Botox treatment, I recommend that my patients avoid heat exposure, alcohol consumption, and strenuous exercise for 24 hours and not lie down flat for four hours. This is because all of these activities may possibly lead to the movement of the product and consequent side effects such as droopy eyelids. Although there have been no definitive studies shown that these actually occur and some physicians do not provide such aftercare instructions, in the absence of data I err on the side of caution and recommend that my patients avoid such activities.

Please consult with a doctor for specific recommendations. Good luck!