1. Was your ear discharge blood stained before the drainage?
2. This seems to be an infection. Ear tumors are rare, though they can cause similar symptoms. Have you had a recent cold?
3. The lump may be an inflamed lymph node
or a parotid gland
swelling. A neck sonography and FNAC can settle the issue. A biopsy can be considered.
4. You should be on antibiotics and other supportive medication
such as painkillers. Pus is acidic and most penicillin based antibiotics will not work well. Add a metronidazole group antibiotic. With so much pus, you should get an ear swab for culture and sensitivity done immediately. Ciprofloxacin
ear drops may be started.
5. Can you provide details of your other health issues? Do you have diabetes?
6. As long as the pus is draining out, it is safe. Some signs that you require urgent attention are:
a. Increase in severity of headache
b. Onset of fever, especially with rigors
c. Facial weakness
e. Visual problems, double vision
f. Projectile vomiting, neck stiffness
g. Severe deafness in your right ear
h. CSF otorrhea.
7. I would definitely rule out malignant otitis externa
and a cholesteatoma. Request an early ENT examination. Three weeks is too long a wait under your circumstances.