I often treat acne with Botox. It is not widely done but it works. I blocks the nerve ending from stimulating the sebaceous gland and therefore there is less oil. It is not a sole treatment and requires other topicals such as Retin A, benzyl peroxide, and antibiotics. It is supplemental for those that have tried many different therapies. Also, laser is a good treatment for recalcitrant acne.
Botox is not a treatment for acne. If you have cystic acne you should contact a board certified dermatologist for treatment and to prevent scars