About Wound Healing. This layer normal?

"HISTORY" 3 months ago I felt a sensation of hardness and pain on the nipple at 12 o'clock, based on the result of USG test early gynocomastia was revealed, and FNAC test was found normal, I left it as it is, after 20-25 days it , The size of my hardness became bigger and redness also started appearing, after 35-40 days an opening was formed on top of this hardness for drainage of secretion, after getting the USG test done again the result was seen as Chronic Abscess, on the 48th day my  surgery was done,                   "QUESTION" Today 45 days have passed since the surgery was completed, But my wound has healed only 65-75 percent, during every dressing a thick yellow fluid used to come out from the wound (very little). From today I have left the wound open, after 7 hours a yellow layer is developing in it, is this layer normal?