So I'm completely new to this but I'm starting to really worry. 

I have recently recovered from Covid which has given me a reason to check over my health a bit more. Since then I have become aware of some small lumps under my armpits and on the muscles under my arms and in my chest. I never really felt around the areas before but as I am still having chest pains for getting over covid, I have felt over the areas more. My worry is that these could be cancerous. I have checked in with a doctor and have a blood test booked but I was wondering, how does it actually feel to have a lump? I undedtsand they can vary in size and are hard, but how does it actually feel when you have a cancerous lump? Is the area numb, can you feel the lumps there? Is it painful without touching it?

Any advice or help would be very great, thank you so much