You are looking at a fresh Botox result and trying to decide whether it is normal or a reason to call someone. This page sorts the effects Cleveland Clinic describes as mild from the ones it says to report as soon as possible.
Start with where the injection went
Cleveland Clinic reports that side effects from botulinum toxin injections vary depending on the area receiving treatment. Before you compare anything to a list, note exactly where the change is. A mark at the injection site and a change somewhere else are different questions.
Mostly mild, usually brief
Cleveland Clinic also says most issues are mild and improve in a day or two. The Cleveland Clinic list of possible effects includes pain, swelling, redness or bruising at the treatment site, flu-like symptoms, headache and neck pain. It also names an upset stomach, temporary drooping eyelids (ptosis) and eye irritation or redness. The Cleveland Clinic overview of botulinum toxin injections carries that first list in full.
Allergic reactions and eye symptoms
A second Cleveland Clinic page, its drug information on cosmetic use, lists side effects to report to your care team as soon as possible. Allergic reactions come first: skin rash, itching, hives, or swelling of the face, lips, tongue or throat. Cleveland Clinic puts eye symptoms on that reporting list too: dryness or irritation of the eyes, eye pain, change in vision and sensitivity to light.
Signs the toxin may have spread
Cleveland Clinic describes spread of botulinum toxin effects as unusual weakness or fatigue, blurry or double vision, trouble swallowing, hoarseness or trouble speaking, trouble breathing and loss of bladder control. Cleveland Clinic places these on the same list of side effects to report as soon as possible. The Cleveland Clinic drug information on cosmetic use sets out that reporting list.
Eye symptoms appear on both lists
Eye irritation or redness is on the first Cleveland Clinic list. Dryness or irritation of the eyes, eye pain, change in vision and sensitivity to light are on the reporting list. Where the two overlap, give the reporting list more weight, because it is the one Cleveland Clinic asks you to report.
Your first step
Hold what you see against both lists. If it matches the reporting list, contact your care team as soon as possible, which is the instruction Cleveland Clinic gives for those effects. If it only matches the first list, measure it against the day or two that Cleveland Clinic mentions, and ask your care team if you are unsure which list it belongs on. For background on the procedure itself, the American Society of Plastic Surgeons page on botulinum toxin is a place to read further.