hello and welcome to HCM,
If you have a lump which is painful to touch and which is there for five months then it is imperative that you get it examined by an ENT.
I would usually examine the area thoroughly and may be advice for an Endoscopic examination of the nose for further analysis. If needed you may even be advised to get a CT of the sinuses
for better assessment.
Meanwhile do steam inhalation and do not try to touch or meddle with the nose
take care and get well soon
Dr Sriram Nathan