hello thanks for consulting at hcm. i feel incisive papilla inflammation is independent of ur swollen joints, hips and knees. ur telling all the tsts were negative,, do u have any anterior teeth problem which might lead to incisive papilae.. for the rash
show ur dermatologist
adn consult a local dentst if inflammatin of incisive papilla doesnt subside with a course of antibiotics and analgesics. hope it helped..