Symptoms - Advice Please

Hello,

Thank you for reading, any advice or words of support are appreciated. 42 year old female.

About 3 months ago I noticed a small lump in my groin. It was fairly soft, moveable and painless. I didn’t rush to the GP as I thought it was a cyst or fatty lump. When it didn’t disappear I booked in to see my GP. She confirmed it was an enlarged lymph node but wasn’t concerned and said it was reactive, although I had no possible reasons or signs as to why this would be the case. She ran some bloods which all came back normal, except for slightly low folate. I am taking folic acid for this now. The lump did feel as if it was shrinking ever so slightly. But never fully disappeared. Fast forward to now - 2/3 weeks later and the lump has got significantly bigger over the last 24 hours, it is now painful / tender and the skin on the surface is red and warm. I’ve been having night sweats for many years - probably 9, so I didn’t think much of this symptom. So my questions is - is it possible to be lymphoma with a painful, red and tender lump / lymph node? Most of what I’m reading suggests this is not the case? I appreciate those reading are not medical professionals, but any experience is appreciated. Thank you for reading. I will be contacting my GP again tomorrow.