I have a bug bite for more than 3 weeks, but it still not heal. it releases a lot of yellow fluid and it's kind of itchy. i only applied neosporin.

See your doc: Sounds like this bite might be infected, or might not be a bite at all. You need an exam to know what next steps to take. Good luck!

?secondary infection: Sounds like your first bite might have got a secondary infection, maybe a staph species, and need an oral antibiotic to clear up.

Insect biteto absces: Neosporin may work , but it has been so long and pus discharge .You have skin infection as abscess , so you need to see the doctor and get treated with antibiotics