90 days post major surgery blue-green cysts coming out of scar. This happened about 600 days post surgery so. Had to scratch surface of skin to remove. What could this be? Pseudema?? It was hard and best described as crystalized gel like but dry.

Color- Normal wound drainage is clear or pale yellow in color; red or dark brown drainage signifies old or new bleeding. Wounds that have a distinctive blue-green drainage present often have Pseudomonas.
What else could it be.
Am stage 4 colon cancer patient taking carboplatin cycle 4.