Gnat bite about 2 weeks ago very painful to touch n swelled, has gone down in size but painful still and lump. had a puss spot init and hickey dots near

Staph Infection: You have a staph infection and it very well may be the MRSA dangerous form of staph. This needs to be evaluated by the family doctor urgently.

Could be infected: Insect bites, are a common cause of cellulitis, which is an infection of the soft tissues in the leg. Given your description, this is certainly a concern. This will most likely require antibiotics, to heal safely. You should be seen by a doctor as soon as possible to make the diagnosis and receive treatment