<s>[INST] Hi - my 5 year old daughter has a 5mm mole (or similar) on her back that is raised and looks to be filled with yellow fluid but is also quite pink in colour. It s symmetrical too. Any idea? The doctor said it didnt look like melanoma as it looked yellow- maybe filled with a fatty fluid... [/INST] HI, Dear, Thanks for the query from you for your 5 yr old daughter, who has 5 mm mole on the back which is quite pink and is symmetrical too.1-I feel concerned that you are serious about the cause of the mole filled with yellow fluid?2- In my opinion dear, your daughter has ?sebaceous cyst with mild infection. Melanoma is out of question and don't worry about it. I agree with your doctor.3-It appears that yellow fluid has come out sometime and has infected the sebaceous cyst.4-The symmetrical presence is just the coincidence of 2 sebaceous cysts on the back of your daughter.5-Antibiotics with proper excision of the infected cyst -is advised on urgent basis. 6-I would advise you to immediately go to ER surgeon and take treatment as advised above.7-Hope this would solve your worry about melanoma, as this mole? Filled with yellow fluid is just an infected sebaceous cyst.8-Wellcome to Chat Doctor for any more query. </s>