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I took a look and it looks like Lymphocystis.At the top of the disease forum there's a sticky with questions that will help in diagnosis. Try to read through and provide some of the information asked for. White light pics and a short video will be very helpful also.
At first I thought lympho but leaning towards flukes which often gets to these fish, If flukes, gills will be red or swollen with rapid breathing, fish acting lethargic or swimming near the water surface, hiding in the corner of tank or behind rocks, loss of appetite, shaking its head, flashing/darting, develop clamped fins, , or scratching against objects. They may also exhibit what looks like yawning from gill irritation develop, cloudy eyes and loss of color .I took a look and it looks like Lymphocystis.
Use search on R2R and you'll get a good understanding of next steps to take whatever it isI took a look and it looks like Lymphocystis.