hello kaykaay12,
huge welp on right leg- you have history of
trauma or bleeding
disorders or associated with fever, it appears in the back side or front of
knee, is there itching over welp, if itching &disappear after 2 hours- likely to be -
Urticaria advice- tablet-
levocetrizine once daily for 3 days, if on back side of knee likely to be backer cyst- its pain less & need Excision, if history of trauma- advice tablet-brufen 400mg twice daily for 5 days, if not subside then advice X-RAY leg AP & Lateral, if bleeding disorders- advice-PT & APTT, bleeding &clotting time, treatment depends on underlying condition, hope my advice is useful to you, thank you.