Types Of Wound Drainage And How To Tell When It Is Serious Serosanguineous Drainage and Wound Healing Baltic Born Womens Marie Mock Neck Maxi Dress Dark Green Floral Size: XS Think You Know Slough Wounds? Net Health Wound drainage types , Drainage can be (1) serous (clear and thin; may be present in a healthy, healing wound), 2) serosanguineous (containing blood; may also be present in a healthy, healing wound),