Hello dear, Thank you for your contact to health care magic. I read and understand your concern. I am Dr Arun Tank answering your concern. Cystic hygroma is very notorious for the infection. I advice you should do culture and sensitivity from the discharge. And once the report is received you can take the treatment accordingly. Conpleteing the treatment makes you free from the infection. Good hygiene maintenance is utmost important for the hrlsing of the surgical site. Please do regular dressing and cleaning. It play good part in treatment. Uoi can use dettol and betadine followed by polysporin ointment application. Wear a cotton undergarments as it is helpful in treating the infection. Please avoid excessive sweating over the part. I will be happy to answer your further concern on bit.ly/DrArun. Thank you, Dr Arun Tank Infectious diseases specialist, HCM.