7 months post DP lower facelift. Developed a seroma 2 weeks post op. The skin at the seroma site broke down. The wound has decreased in size but has never healed. My PS has investigated twice but no sign of irritating stitches. Antibiotic and steroid creams unsuccessful. Occasionally the scab falls off and the skin underneath looks healed, only for it to break down within a day or so. Photos attached show the development of this wound. Please advise.