Can anything be done to achieve a smooth forehead and minimise these frown muscle 'bumps'? (Photo)

Thank you for your question. Those muscle bumps you are referring to are part of your glabellar muscles, more specifically your corrugator muscles. Botox can help relax those muscles and give your glabellar region (area just above and between your eyebrows) a smoother and softer look. The groove that in the centre that you are referring to that makes you look "frowny" will be softened. The botox injections would not however do anything for your scar between your eyebrows. Hope this helps.

Thank you for your question and photos! The “bumps” you have described are a result of strong corrugator muscles. By injecting these muscles with a neurotoxin (Botox, Dysport, Xeomin) they will become more relaxed and give a much softer appearance. I recommend microneedling with PRF or microneedling with radiofrequency to reduce the appearance of your forehead scar. As always, these treatments should be performed by an experienced provider to optimize safety and effectiveness.
Best of luck,
Dr. Kian 

Botox it Is a wonderful option for improving wrinkles of the forehead/eyes and it can be very addictive because people love what they see. When given in certain spots, your surgeon can achieve a “chemical Brow lift” with Botox alone. There are also many other options such as laser and chemical peels that can further improve the skin itself. Botox works by relaxing the muscles and usually needs to be repeated every 3 to 6 months.
Surgery is another option but obviously more invasive and has scars.
I would recommend that you see a board-certified plastic surgeon in your area that is a member of both ASPS & ASAPS and performs a lot of brow lifts but also offers all the nonsurgical options such as Botox injectables and laser treatments. Go over your concerns with them and make sure you walk out of there with several options. I hope this helps.

Botox has an excellent track record and is FDA approved for the frown lines. However, a full in-person evaluation is preferred for every patient before administering treatments addressing specific concerns.For best results, always see an expert injector. Dr. ALDO 

Dear Peppypiper,
Thanks for your question, botox can work by relaxing the muscle and over time this should reduce the muscle bulk. You may not achieve the result you want the first time you have treatment but over several sessions this muscle will hypertrophy and be less visible. The reason for this is that botox blocks the signal from the nerve to the muscle and prevents the muscle from contracting. 
All the best