Art (California) on 12/22/2023

Have you tried applying Povidone iodine(the type typically available at drug stores) as it has shown the ability to penetrate skin. Here are typical products on Amazon for comparison :

https://www.amazon.com/s?k=povidone+iodine&crid=1X68WWC84WOXA&sprefix=povidone,aps,132&ref=nb_sb_ss_ts-doa-p_1_8

If there is inflammation and possibly pain in the area surrounding the seroma, you might try melatonin lotions as I discussed here :

https://www.earthclinic.com/supplements/topical-melatonin-pain-relief-success-stories.html

Good luck and keep us posted!

Art