If you attended a consultation, you can obtain your official documentation through these legitimate channels: IMSS Digital App:
A real IMSS certificate has a QR code and a folio. If yours doesn’t have those, it’s not valid. justificante medico imss pdf editable
However, if you are a doctor or a medical administrator looking for a to issue a valid medical excuse, or if you need to know how to obtain an official one, I can provide information on the standard formats used by the IMSS (Instituto Mexicano del Seguro Social) and safe alternatives for editing authorized PDFs. If you attended a consultation, you can obtain